7.102 g of Na₂SO₄ (M = 142.04 g mol^–1) is dissolved in water to prepare ${\text{0.5000 d}}{{\text{m}}^{\text{3}}}$ of solution. What is the concentration of ${\text{N}}{{\text{a}}_{\text{2}}}{\text{S}}{{\text{O}}_{\text{4}}}$ in ${\text{mol}}\,{\text{d}}{{\text{m}}^{ - 3}}$?

A.     $2.500 \times {10^{ - 2}}$

B.     $1.000 \times {10^{ - 1}}$

C.     $1.000 \times 10$

D.     ${\text{1.000}} \times {\text{1}}{{\text{0}}^{\text{2}}}$

B