CHM1100c MOD 5 quiz-Latest Spring

CHM1100c MOD 5 quiz • Question 1 0 out of 2 points How much heat is required to convert 35 g of ice at -6.0 ˚C to water vapor at 102 ˚C? ( ; ; specific heat of water is ; specific heat of ice is ; specific heat of water vapor is ) Selected Answer: 90.8 kJ Answers: 152 kJ 90.8 kJ 106 kJ 91.4 kJ • Question 2 2 out of 2 points For the following reaction below, calculate how many moles of FeS form when 0.756 moles of the S 8 reactant completely reacts. Assume there is excess of the other reactant. Selected Answer: 6.05 mol FeS Answers: 2.54 mol FeS 6.05 mol FeS 0.756 mol FeS 0.095 mol FeS • Question 3 0 out of 2 points Determine the limiting reactant and theoretical yield of MgO, when 3.07 g of Mg reacts with 4.09 g of O 2 in the following chemical equation. Selected Answer: O 2 ; 10.3g MgO Answers: Mg; 5.09g MgO O2; 10.3g MgO Mg; 0.256g MgO O2; 0.126g MgO • Question 4 Consider the reaction: 2 out of 2 points What minimum volume of 3.50 M H 3 PO 4 is required to produce 10.0 L of H 2 at STP? Selected Answer: 8.50 x 10 - 2 L Answers: 8.50 x 10 - 2 L 523 L 1.91 x 10 - 1 L 117.6 L • Question 5 Consider this reaction at equilibrium: Predict the effect of increasing the reaction volume. Selected Answer: Shift left Answers: 0 out of 2 points No effect Shift right Shift left • Question 6 2 out of 2 points If the theoretical yield of the following reaction is 3.43g of MgO and the actual yield is 2.48g of MgO, what is the percent yield? Selected Answer: 72.3% Answers: 138% 0.723% 1.38% 72.3% • Question 7 2 out of 2 points Write the equilibrium expression for each chemical equation: Selected Answer: Answers: