a) How many grams of solid calcium carbonate must decompose to produce solid cal
ID: 1020415 • Letter: A
Question
a) How many grams of solid calcium carbonate must decompose to produce solid calcium oxide and 542.0 mL carbon dioxide gas at 298°C and 729 torr?
b)A piece of magnesium reacts with an aqueous solution of HCl to produce H2 gas. The hydrogen gas is collected over the HCl solution at a temperature of 22.0°C. If the total pressure of the system is 0.983 atm, and the volume of gas collected is 710. mL, what are the partial pressure and the mass of H2 produced? (You may assume that the dissolved HCl has no effect on the vapor pressure of water, which is 19.8 torr at 22.0°C.)
partial pressure atm mass gExplanation / Answer
CaCO3(s) = CaO(s) + CO2(g) eqn 1
PV = nRT
P = 729 torr or 0.959211 atm
V = 542.0 mL or 0.542 Liter
n = ?
R = 0.0821 L atm K- 1 Mole-1
T = 298 + 273 = 571 K
Using above equation find Moles
n = 0.959211 x 0.542 / 0.0821 x 571 = 0.01109 Moles
According to equation one 0.01109 Moles of CO2 produced from same mole of CaCO3
Hence 0.01109 Moles CaCO3 = 0.01109 x 100 = 1.109 gm of CaCO3 was decomposed.
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