Final answer:
To calculate the mass of CO gas measured at STP, divide the volume by 22.4 L/mol to get the number of moles. Then, multiply the number of moles by the molar mass of CO to calculate the mass in grams.
Step-by-step explanation:
To calculate the mass of CO gas, we need to use the ideal gas law. At STP (Standard Temperature and Pressure), 1 mole of any gas occupies 22.4 liters. Since we know the volume of CO gas is 2.74 liters, we can calculate the number of moles of CO gas by dividing the volume by 22.4:
Moles of CO gas = 2.74 L / 22.4 L/mol = 0.122
The molar mass of CO is approximately 28.01 g/mol, so to calculate the mass of CO gas, we multiply the number of moles by the molar mass:
Mass of CO gas = 0.122 mol x 28.01 g/mol = 3.42 g
Therefore, the mass of 2.74 L of CO gas measured at STP is approximately 3.42 grams.