Question

how many milligrams are present in 8.8743 x 10^22 molecules of chlorine gas at STP?

Answer 1

Chlorine gas has a molar mass of 70.9g/mol

$Mass=no.moles*molar\ mass\newline no.moles=\dfrac{8.8743×10^{22}}{6.0221×10^{24}}=0.01474$

$Mass= 0.01474×70.9=1.045g\newline mass\ of\ Cl_2\ is\ 1045\ mg$