Question

How many grams are in 2.61x10^24 molecules of CO2?

Answer 1

Molar mass of CO_2

• 12+2(16)=12+32=44g/mol

$\\ \tt\Rrightarrow No\:of\:moles=\dfrac{No\:of\: molecules}{Avagadro's constant}=\dfrac{2.61\times 10^{24}}{6.022\times 10^{23}}=0.433(10)=4.33mol$

Now

$\\ \tt\Rrightarrow Mass=No\:of\;moles\times Molar\:mass$

$\\ \tt\Rrightarrow Mass=4.33(44)=190.52g$