Question

15.8 liters NF3 (at STP) converted to grams

Answer 1

Mass NF₃ at STP : 50.06 g

Further explanation

Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure). At STP, Vm is 22.4 liters/mol.

15.8 L at STP, mol NF₃ :

$\tt \dfrac{15.8}{22.4}=0.705$

mass NF₃ (MW=71 g/mol) :

$\tt mass=mol\times MW\\\\mass=0.705\times 71\\\\mass=50.06~g$