For #18-22, you may refer to the following relationships: and your with Calculations: SHOW WORK BOX ANSWER UNIT (ALL temperatures MUST be in K, NOT oC) 18. What is the volume of 2.00 moles of a gas at STP? PV = nRT (1.00 atm) = (2.00 mol)(0.0821)(273 K) = (2.00)(0.08206)(273) = 44.8 L V V V (1.00) 2.00 mol x 22.4 L = 44.8 L OR 1 mol 19. A 3.50 mol sample of a gas at 305 K and a pressure of 800 mmHg. What is the volume of the gas? 20. If 32.0 grams of a gas occupies 12.5 liters at 1.42 atm and 298 K, what is the molar mass of the gas? 21. Consider the reaction: N2(g) + 3 H2(g) 2 NH3(g) What is the total number of liters of NH3 produced when 11.2 liters of H2 reacts completely at STP? 22. Consider the reaction: Mg(s) + 2 HCl(aq) MgCl2(aq) + H2(g) When 48.6 grams of Mg(s) reacts completely, what is the volume of H2(g) produced if the reaction occurs at 22.0°C and 0.910 atm?
For #18-22, you may refer to the following relationships: Calculations: SHOW WORK and BOX your ANSWER with UNIT (ALL temperatures MUST be in K, NOT oC) 18. What is the volume of 2.00 moles of a gas at STP? PV = nRT (1.00 atm) V = (2.00 mol)(0.0821)(273 K) V = (2.00)(0.08206)(273) V = 44.8 L (1.00) OR 2.00 mol x 22.4 L = 44.8 L 1 mol 19. A 3.50 mol sample of a gas at 305 K and a pressure of 800 mmHg. What is the volume of the gas? 20. If 32.0 grams of a gas occupies 12.5 liters at 1.42 atm and 298 K, what is the molar mass of the gas? 21. Consider the reaction: N2(g) + 3 H2(g) 2 NH3(g) What is the total number of liters of NH3 produced when 11.2 liters of H2 reacts completely at STP? 22. Consider the reaction: Mg(s) + 2 HCl(aq) MgCl2(aq) + H2(g) When 48.6 grams of Mg(s) reacts completely, what is the volume of H2(g) produced if the reaction occurs at 22.0°C and 0.910 atm?
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