Question

The number of atoms in a 158.4 g sample of CO2 gas at STP is:

1.277 x 1025 atoms

2.167 x 1024 atoms

6.502 x 1024 atoms

6.651 x 1024 atoms

Answer 1

Answer:

Option B, 2.167 x 1024 atoms

Explanation:

1 mole of CO2 = 44.01 grams

Number of moles of CO2 in 158.4 gram sample

$\frac{158.4}{44.01} \\3.95$moles

Number of atoms in one mole is $6.02*10^{23}$

Number of atoms in 3.95 moles $2.167 *10^{24}$

Hence, option B is correct