Question

1. Calculate the number of grams of O2 that are collected when 250-mL of water are displaced from an inverted flask at 20°C and 746.2 mmHg.

The vapor pressure of water at 20 °C is 17.535 torr.

A) 0.319 g

B) 0.00997 g

C) 728 g

D) 42.3 g

E) 1.069 g

F) 0.327 g

2.

A ballon filled with 25.0 g of oxygen gas and 10.0 g of hydrogen gas at 1.0 atm is ignited and reacts to form water in a room with a temperature of 25 °C.

How many liters of water vapor are produced?

A) 1.36 L

B) 38.2 L

C) 2.17 L

D) 483 L

E) 6.35 L