Question

what is the mass of 56 cm^3of carbon monoxide at STP

Answer 1

To find the mass of carbon monoxide, we need to find the number of moles first.

*The molar volume at STP is 22.4dm³.

Number of moles

= Volume ÷ 22.4dm³

= 56cm³ ÷ 22.4dm³

= (56 ÷ 1000) ÷ 22.4dm³

= 0.056dm³ ÷ 22.4dm³

= 0.0025 moles

The formula to find mass is: number of moles × molar mass

Mass = 0.0025 moles × 28g/mol which will give you 0.07g.