Question

a ballon with a volume of 8.00 L is known to contain 1.200 moles of gas. How many moles of gas remain if some gas is released and the new volume is 5.25 L. Assume temperature and pressure remain constant

Answer 1

$V1n1=V2n2$

$8×1.2=(5.25)n2$

n2 is the new moles

$n2=\frac{8×1.2}{5.25}=1.83moles$