Answer to Question #334991 in General Chemistry for eliana

Question

a gas jar contains 240cm³ of carbon dioxide gas. calculate :

a) number of moles of carbon dioxide gas

b) number of molecules of carbon dioxide gas

c) mass of carbon dioxide gas

Answer 1

V(CO₂) = 240 cm³ = 0.24 L

a) n(CO₂) = V(CO₂) / V_m(CO₂)

n(CO₂) = 0.24 L / 22.4 L/mol = 0.011 moles

b) N(CO₂) = n(CO₂) * N_A

N(CO₂) = 0.011 moles * 6.02 ×10²³ mol⁻¹ = 6.622 ×10²¹ molecules

c) m(CO₂) = n(CO₂) * Mr(CO₂)

m(CO₂) = 0,011 moles * 44.01 g/mol = 0.48 g