Question

how many molecules are contained in each compound?
A. 1.35 mol of carbon disulfide (CS2)
B. 0.254 mol of diarsenic trioxide (As2O3)
C. 1.25 mol of water
D. 150.0 mol of HCL

Answer 1

37010, Inorganic Chemistry

how many molecules are contained in each compound?

A. 1.35 mol of carbon disulfide (CS2)

B. 0.254 mol of diarsenic trioxide (As2O3)

C. 1.25 mol of water

D. 150.0 mol of HCL

Solution:

One mole of the same compound contains $6.02 \cdot 10^{23}$ molecules (Avogadro's number).

So, in case of:

A) $n(\mathrm{CS}_2) = 1.35 \cdot 6.02 \cdot 10^{23} = 8.13 \cdot 10^{23}$ molecules;

B) $n(\mathrm{As}_2\mathrm{O}_3) = 0.254 \cdot 6.02 \cdot 10^{23} = 1.53 \cdot 10^{23}$ molecules;

C) $n(\mathrm{H}_2\mathrm{O}) = 1.25 \cdot 6.02 \cdot 10^{23} = 7.53 \cdot 10^{23}$ molecules;

D) $n(\mathrm{HCl}) = 150.0 \cdot 6.02 \cdot 10^{23} = 903.0 \cdot 10^{23} = 9.03 \cdot 10^{25}$ molecules.