Assuming 100% yield, calculate the mass of MgO that should be made starting from 1g of Mg. There is a separate salary chart covering some Information Technology positions that fall under the Technical Pay Law (TPL). Favorite Answer. Calculate Reactant Needed to Make a Set Amount of Product . Calculate the Moles using the formula Moles = Mass/Mr: 25/40.3=0.62mol. of Labor. The balancing numbers in an equation can be worked out using masses found by experiment. (b) The student hypothesizes that the design of the heating pad could be changed to enable it to heat 150.0 g of water from 25.0 q C to 90.0 q C by using a greater mass of CaO(s). The other reactant, glucose has a molar mass of (6 atoms C x 12 g C/mol) + (12 atoms H x 1 g H/mol) + (6 atoms O x 16 g O/mol) = 180 g/mol. Determine MW using a periodic table by adding the atomic mass of each atom in the chemical formula. minimum and will be higher for certain courses and in certain institutions. Calcium oxide reacts with carbon to make 128 g of calcium carbide. 0.00496 g H2O A. Calcium carbonate (CaCO3), an important component of coral reefs, can decompose when heated, forming calcium oxide (CaO) and carbon dioxide (CO2) according to the equation below: CaCO3 es002-1.jpg CaO + CO2 How many moles of CaO form when 98.60 g CaCO3 decompose? Choose the correct setup for calculating the mass of HCl required to form a given mass of NaCl. So, cubic system is fcc type. The solubility of calcium hydroxide at 25°C is 0.12 g/100 mL water. Calculate the minimum mass of iodine that this student would have used to form 10.0 g of triiodomethane. Show clearly how you work out your final answer. So, 4-molecules of CaO are present in 1 unit cell. How to Answer the Question: (1) Write the balanced chemical equation for the … eveanne1221. Reply. mass CaO = 0.034 moles x 56 g/mole = 1.90 grams (3 significant figures) Upvote • 0 Downvote. 1 dm 3 = 1000 cm 3, so in 19.7 cm 3 of the HCl solution there will be; 19.7 x 7.3 / 1000 = 0.1438 g HCl (c) Calculate the mass of MOH that reacts with the mass of HCl calculated in (b). AS Level results are frequently cashed in along with A2 Level results in the final year. (c) A student prepares a solution of sodium sulfate, Na 2SO 4, by adding 6.25 × 10–2 mol dm–3 sulfuric acid, H 2SO 4, from a burette to 25.0 cm 3 of 0.124 mol dm–3 NaOH in a conical flask. Mass of CO 2 = relative formula mass × amount = 44 × 0.01 = 0.44 g. Calculating balancing numbers. Lv 7. ii. d. The student determines the molar mass of the gas to be 64 g mol-1. (b) Calculate the minimum mass of CaO(s) that the student would need to use in order to cause the temperature change described in part (a). The data for the experiment are shown in the table below. 1.0 g of calcium carbonate decomposes to form calcium oxide and carbon dioxide: CaCO 3 (g) \(\rightarrow\) CaO(s) + CO2(g) Calculate the maximum mass of carbon dioxide that can be produced. (1) (iii) the minimum amount, in moles, of carbon that is required to make this amount of calcium carbide. a. Calculate the value of q when 5.00 g of H 2 O 2 (l) decomposes at constant pressure. The calculation of density is quite straightforward. Relative atomic masses: H = 1; C = 12; O = 16; Na = 23. The first thing to do here is to calculate the relative formula mass of CaCO 3 and CO 2.. RFM of CaCO 3 = 40 g + 12 g + (16 g x 3) = 100 g. RFM of CO 2 = 12 g + (16 g x 2) = 44 g. The decomposition equation shows 1 CaCO 3 goes to 1 CaO and 1 CO 2.. We have 50 g of CaCO 3, effectively we have half a CaCO 3.. 50 g / 100 g = 0.5 Calculate the minimum mass of CaO(s) that the student would need to use in order to cause this temperature change. (40 + 12 + 3x16) ( (40 + 16) + (12 + 2x16) 100 ( 56 + 44, scaling down by a factor of two, 50 ( 28 + 22 . © 2003-2021 Chegg Inc. All rights reserved. Pages 8 This preview shows page 3 - 6 out of 8 pages. CcL+C+-C ­ 4-0 +-f ~f- r;). A student solved the following problem and found the equilibrium concentrations to be [SO 2] = 0.590 M, ... What is the minimum mass of CaCO 3 required to establish equilibrium at a certain temperature in a 6.50-L container if the equilibrium constant (K c) is 0.050 for the decomposition reaction of CaCO 3 at that temperature? (b) The student hypothesizes that the design of the heating pad could be changed to enable it to heat 150.0 g of water from 25.0 q C to 90.0 q C by using a greater mass of CaO(s). However, it is important to pay special attention to the units used for density calculations. How to calculate the percent yield of a chemical reaction? Salary charts reflect full-time salaries for employees who work 37.5 or 40 hours per week. & Get a free answer to a quick problem. Q7 A 50.0 cm 3 sample of sulphuric acid was diluted to 1.00 dm 3. m is the mass V is the volume. 25cm 3 of the 250 cm 3 MOH solution was used, so the mass … Round off your answer to three significant figures. Start here or give us a call: (312) 646-6365, Calculate the mininum mass of calcium oxide, CaO(s), that a student must use to attain the amount of heat of a 150.0 g sample of water from 25.0 degrees C to 60.0 degrees C. (I already calculated that 150.0 g of water from 25.0 degrees C to 60.0 degrees C is 21,900 J but how do I find the minimum mass of CaO? All Executive Department bargaining unit, confidential, and managers are covered by salary charts. Let's change our example slightly: How many grams of hydrogen gas and oxygen gas are … The results are shown in the table. In a study of the decomposition of calcium carbonate, a student added a 50.0 g sample of powdered CaCO 3 (s) to a 1.00 L rigid container. answered • 01/05/17, Ph.D. University Professor with 10+ years Tutoring Experience. CAO accepts no responsibility for any calculation or entry errors. 3 Answers. The relative formula mass (Mr) of salicylic acid (C7H6O3) is 138. Calculate the mass of 1.5 mole of methane CH4 How to find mass number without knowing no of neutrons and atomic mass . € 5 Page 5 of 23. Divide the mass of the chemical by the total mass of the compound and multiply by 100. 1 decade ago. Families and individuals working in low-wage jobs make insufficient income to meet minimum standards given the local cost of living. Looking up this value, one finds it to be. List the measurements that must be made in order to calculate the molar mass of the gas. This is very helpful for me,best for every students. The student sealed the container, pumped out all the gases, then heated the container in an oven at 1100 K. Homework Help. To review this step in more detail, you can review Calculate Molar Mass. i Calculate the amount of heat, in joules, that the water must absorb for its temperature to change by this amount. Molecular weight (MW) is the weight of one mole of a chemical. The acceleration due to gravity, g, is 9.8 m s–2. Capitalize the first letter in chemical symbol and use lower case for the remaining letters: Ca, Fe, Mg, Mn, S, O, H, C, N, Na, K, Cl, Al. € Experiment 1 2 3 Mass of copper oxide used in g 4.0 4.0 4.0 Mass of copper produced in g 3.3 3.5 3.2 (i)€€€€€€Calculate the mean mass of copper produced in these experiments. It finds its application in the manufacturing of cement, paper, and high-grade steel. the recommended daily allowance of calcium is 1.2 g. calcium carbonate contains 12.0 % calcium by mass. So, no. Uploaded By ProfessorPuppyMaster273. Formula in Hill system is CaO: Computing molar mass (molar weight) To calculate molar mass of a chemical compound enter its formula and click 'Compute'. Show the set-up for your calculations in order to receive full credit. Attorney General Opinion Letter MW-02-13-02: Applicability of M.G.L. A sample of the diluted sulphuric acid was analysed by titrating with aqueous sodium hydroxide. (4 marks) 7. The student hypothesizes that the design of the heating pad could be changed to enable it to heat 155.0 g of water from 25.0 C to 90.0 C by using a greater mass of Cao(s). Calculate the… When placed in water, CaOls) reacts as shown by the equation above. (3) (Total 9 marks) Figure 1 shows an apparatus for investigating forced vibrations and resonance of a mass-spring system. Example 1: (5/105) x 100 = 0.04761 x 100 = 4.761%. Calculate the minimum speed which will keep the motorcycle in contact with the track at position Q. x = 0.034 moles CaO. Learn more about the differences between mass and weight, or explore hundreds of other calculators addressing the topics of fitness, math, finance, and health, among others. This online tool will also display a conversion scale that automatically refreshes to relate to the current values and units selected. (4 marks) Ksp for CaSO4 = 2.6 x 10-5. b. c. Explain the purpose of equalizing the water levels inside and outside the gas collection tube. Calculate the mass of carbon dioxide that could be made from 11 g of sodium hydrogencarbonate. In the titration, 25.0 cm 3 of 1.00 mol dm-3 aqueous sodium hydroxide required 20.0 cm 3 of the diluted sulphuric acid for neutralisation. (d) Calculate the minimum volume of distilled water, in liters, necessary to completely dissolve a 5.0 g sample of AgBr(s) at 298 K. (The molar mass of AgBr is 188 g mol−1.) Now that the equation is filled in, simply solve to calculate the mass percent. _____ _____ Mass of copper produced = _____ g (1) (c) €€€€The experiment was done three times. The concentration of the copper(II) sulfate solution is 80 g CuSO4 per dm3. 5 0 l i t r e container for the reaction: C a C O 3 ( s ) ⇌ C a O ( s ) + C O 2 ( g ) ; K c = 0 . Answer: –14.4 kJ. The time is taken by an object to orbit any planet depends on that planet’s gravitational pull. Add comment. how many grams of calcium carbonate are needed to provide the rda of calcium Chemistry A student performed an analysis of a sample for its calcium content and got the following results: 14.92% , 14.91%, 14.88% , 14.91%. of O – – ion = 4. The concentration of the copper(II) sulfate solution is 80 g CuSO 4 per dm 3 . i. Write down the balanced chemical equation: CaCO 3 \(\rightarrow\) CaO + CO 2 You need 21.9 kJ (amount YOU calculated from water), so. (ii) Calculate the minimum mass of CaO(s) that the student would need to use in order to cause this temperature change. (Assume that both ASpan and AHan are constant between 25.0 °C and 85.0°C) ii. In an experiment using this reaction, the yield of triiodomethane (CHl3) obtained by a student was 83.2%. CaCO 3 decomposition:. The mass of copper oxide used and the mass of copper produced were measured each time. J.R. S. b. Calculate the mass percent. The student measured the mass of a sealed 843 mL rigid flask that contained dry air. Example: For the MW of CaCl 2, add the atomic mass of Ca (40.01) to that of two Cl (2 x 35.45) to get 110 It is revised annually. According to Equation 5.18, 890 kJ is released by the system when 1 mol CH. The mass of copper oxide used and the mass of copper produced were measured each time. Choose an expert and meet online. Question 1: A student has been given 250 mL of water at 25°C and needs to add enough calcium hydroxide to make a saturated solution. Give your answer to the appropriate precision. Convert grams CaO to moles or moles CaO to grams. CAO advises GCE applicants to discuss their AS Level certification process with their school. The student is provided with an 11.78 g/100 mL (%) aqueous sodium chloride solution. Question: CaO) + H,O0) + Ca(OH) (3) AH = -63.7 KJ/mol, Calcium Oxide, CaO(s), Has Been Proposed As A Substance That Can Be Used To Heat Water Quickly For Portable Heating Packs Or For Cooking. The student hypothesizes that the design of the heating pad could be changed to enable it to heat 155.0 g of water from 25.0 C to 90.0 C by using a greater mass of Cao(s). (ii) Calculate the minimum mass of CaO(s) that the student would need to use in order to cause this temperature change. Solution for Acidic water can be treated with basic substances to increase the pH, although such a procedure is usually only a temporary cure. . It is extensively used for medicinal purposes and insecticides. CaO+H 2 SO 4 → CaSO 4 +H 2 O. CaO: Calcium Oxide : Density: 3.34 g/cm³: Molar Mass: 56.0774 g/mol: Solubility: Soluble in water & glycerol: Boiling Point: 2,850 °C: Melting Point: 2,572 °C: Uses of Calcium Oxide. Show clearly how you work out your final answer. Includes links to federal laws and regulations, and web pages on a variety of minimum wage … 25cm 3 of the 250 cm 3 MOH solution was used, so the mass … then, Qwater= 155*4.18*(60-25) = 22676 J = 22.676 KJ. Reagent Volume-Mass Calculations. Worked Example of Using Mole Ratio to Calculate Mass of Reactant or Product. 635.5 kJ/mole * (x mole) = 21.9 kJ. The concentration of the copper(II) sulfate solution is 80 g CuSO 4 per dm 3 . No packages or subscriptions, pay only for the time you need. Justify your answer Most questions answered within 4 hours. These are the two main information scientists use to measure the mass of a planet. The Question: 12.2 g of magnesium metal (Mg (s) ) reacts completely with oxygen gas (O 2(g)) to produce magnesium oxide (MgO (s)). Privacy High-temperature mass spectrometric study of the vaporization processes in the system CaO-MgO-Al 2 O 3 -Cr 2 O 3 -FeO-SiO 2 ›› CaO molecular weight. There are many different ways to express density, and not using or converting into the proper units will result in an incorrect value. In chemical formula you may use: Any chemical element. Which substance, when added to the Ca(OH)2 mixture, would increase the molar solubility most significantly? CaO(s) + H2O(U)-> Ca(OH)2(s) calcium oxide, CaO(s), has been proposed as a substance that can be used to heat water quickly for portable heating packs or for cooking. The concentration of Ca2+ ions is usually expressed as ppm CaCO 3 in the water sample. Calculate the minimum mass of iron needed to displace all of the copper from 50 cm3 of copper(II) sulfate solution. Use the data in the table below to determine the standard entropy change, Sn, in J/ (K molpan) for the reaction Substance CaO(s) H20(0) Ca(OH)2(s) Absolute Entropy at 25°C (/(K mol) 83 70 40 with a calculation. State the low of mass conservation How to find Number of neutrons in an atom if you don't know it's mass number and atomic mass? As a result, candidates often will not have evidence of their AS Level results until the release of their A2 Level results in August. Relevance. 4 The equation for the reaction is… (c) A student prepares a solution of sodium sulfate, Na 2SO 4, by adding 6.25 × 10–2 mol dm–3 sulfuric acid, H 2SO 4, from a burette to 25.0 cm 3 of 0.124 mol dm–3 NaOH in a conical flask. What is the minimum mass of C a C O 3 (s), below which it decomposes completely, required to established equilibrium in a 6. Step 3: Work out the calculated mass of the aspirin. Solve: (a) Because the bowling ball is raised to a greater height above the ground, its potential energy increases. Explain your answer based on chemical equilibrium principles. €€€€€€€€€ The relative formula mass (M r ) of salicylic acid, C 7 H 6 O 3 , is 138 This compound is also known as Calcium Oxide. 1 dm 3 = 1000 cm 3, so in 19.7 cm 3 of the HCl solution there will be; 19.7 x 7.3 / 1000 = 0.1438 g HCl (c) Calculate the mass of MOH that reacts with the mass of HCl calculated in (b). Calculate the maximum mass of aspirin that could be made from 100 g of salicylic acid. Calculate the minimum mass of iodine that this student would have used to form 10.0 g of triiodomethane. Molecular weight calculation: 40.078 + 15.9994 ›› Percent composition by element Looking up this value, one finds it to be, -635.5 kJ/mole. A student wants to design a heating pad that could heat a 155.0 g sample of water from 25.0 °C to 60.0 °C. Calculate the mass of CaCO3 that would produce 40 mL of CO2 at STP....Please show calculation... Answer Save. Practice Exercise. This is equivalent to 1 gram of CaCO Attorney General. (b) Calculate the mass of HCl used in each titration. Calculate the value of the Ksp for SrF2 if the solubility is 0.122 g/L. Use this calculator to determine the weight of an object from its mass and the acceleration due to gravity at a particular geographical location. Applicants must also refer to HEI websites for details of specific subject requirements and previous points requirements. | Study Materials. Figure 2 shows the displacement-time graph when the system is resonating. A 2.634 g sample containing impure CuCl_2 \cdot 2H_2O was heated. First, we need to write a chemical equation for this reaction. The student then flushed the flask with the unknown gas, resealed it, and measured the mass again. Calculate the percentage yield to 3sf. ii. Analyze: Our goal is to use a thermochemical equation to calculate the heat produced when a specific amount of methane gas is combusted. 98.60 g … For future years, it will, therefore, act as a guideline only. How to solve: Assume that the mass of the bullet, m_1, is 4.97 g, the mass of the pendulum, m_2, is 1.029 kg, and h is 4.71 cm. The actual mass obtained is … Solution. What is the minimum mass, in grams, of calcium hydroxide that the student must add to the water? /'711:l-o When Placed In Water, CaO(s) Reacts As Shown By The Equation Above. (b) The ball has a mass of 5.4 kg, and it is lifted a distance of 1.6 m. To calculate the work performed to raise the ball, we use both Equation 5.3 and . molecular mass of magnesium chloride is? of Ca + + ion = 4. b. Justify your choice based on concepts of chemical equilibrium, such as LeChatelier's principle. From the chemical equation above we can see that the ratio of MgO to Mg is 2:2, so the number of Moles of MgO you have is the same as the number of Moles of Mg you have, meaning you also have 0.62mol Mg. Rearrange Moles = Mass/Mr to find Mass: The combined mass of both reagents and containers is 255.98 g. This free mass calculator calculates mass, given density and volume, using various standard units of measurement. This will give you the mass percent of the chemical. Both the air and the unknown gas were at 23.0°C and 750. torr. 6. (1) (ii) the amount, in moles, of calcium carbide made in the reaction. (iii)€€€€Calculate the maximum mass of copper that could be produced from 4.0 g of copper oxide. In an experiment using this reaction, the yield of triiodomethane (CHl3) obtained by a student was 83.2%. 0 0 5 m o l e / l i t r e Calculate the relative formula mass of MgO. No. Example View desktop site, 1. a) (i) Qrxn= -Qwater now, heat change of water(Qwater)= mass of water*specific heat of water* temperature change. (Assume that the specific heat capacity of water is 4.18 J/(g °c). This strategy can be slightly modified to calculate the amount of reactants needed to produce a set amount of product. Calculate the minimum mass of iron needed to displace all of the copper from 50 cm3 of copper(II) sulfate solution. 1 EDTA Titration Calculations The hardness of water is due in part to the presence of Ca2+ ions in water. Solution for Calculate the mass of limestone that must be decomposed to produce 415 g of CaO is produced.

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