A 0.429-g sample of gas occupies 125 mL at 60. cm of Hg and
25°C. What is the molar mass of the gas?
Group of answer choices
8.9 g/mol
66 g/mol
88 g/mol
106 g/mol
How many liters of oxygen are needed to exactly react with 55.6
g of methane (CH4) at STP?
CH4(g) + 2
O2(g) ? CO2(g) +
2 H2O(l)
Group of answer choices
19.5 L
39.0 L
156 L
77.8 L