Question

How many moles of gas are needed to fill a 500mL ziplock bag?

A) 0.02 moles
B) 1 mole
C) 0.5 moles
D) 2 moles

Answer 1

The number of moles of gas needed to fill a 500 mL ziplock bag is approximately 0.022 moles, which corresponds to option A) 0.02 moles.

Step-by-step explanation:

The subject of the question pertains to the concept of molar volume in chemistry, specifically the amount of gas needed to fill a specified volume at standard temperature and pressure (STP).

At STP (0°C and 1 atm), one mole of an ideal gas occupies 22.4 liters. To find out how many moles are needed to fill a 500 mL ziplock bag, we convert 500 mL to liters. Since 1000 mL is equivalent to 1 L, 500 mL is equal to 0.5 L. Using the ratio of 1 mole per 22.4 L, we calculate:

Number of moles = Volume of gas at STP / Molar volume at STP = 0.5 L / 22.4 L/mol

Number of moles = 0.5 / 22.4 ≈ 0.022 moles

The correct answer is A) 0.02 moles.