What is the pressure of the CO2 within the flask?

Question

A mass of 0.650g of calcium carbonate is added to 50.0mL of 0.275 M HCL. If the CO2 gas is collected in a 1.00L flask at 25C

Answer 1

Moles CaCO3 = 0.650 g / 100 g/mol = 0.00650

Moles HCl = 0.0500 L x 0.275 = 0.0138

CaCO3 + 2 HCl ==> CO2 + H2O + CaCl2

the ratio is 1 : 2 and HCl is in excess ( 2 x 0.00650 = 0.013 moles of HCl are needed)

Moles CO2 = 0.00650

p = nRT / V = 0.00650 x 0.0821 x 298 K / 1.00 L =  0.159 atm