The weight of 1 × 1022 molecules of CuSO4.5H2O is

Question

The weight of 1 × 1022 molecules of CuSO4.5H2O is (A) 41.59 g (B) 415.9 g (C) 4.159 g (D) None of these

Tardigrade Admin · Accepted Answer

[∵ Molecular weight of CuSO4.5H2O=63.5+32+64+90=249.5] 6×1022 molecules has weight = 249 g 1 × 1022 molecules has weight=(249.5×1×1022/6×1023) = 4.158

Q. The weight of $1 \times 1 0^{22}$ molecules of $C u S O_{4} .5 H_{2} O$ is

$41.59 g$

$415.9 g$

$4.159 g$

None of these

$[∵ M o l ec u l a r w e i g h t o f C u S O_{4} .5 H_{2} O = 63.5 + 32 + 64 + 90 = 249.5]$
$6 \times 1 0^{22}$ molecules has weight $= 249 g$
$1 \times 1 0^{22}$ molecules has weight $= \frac{249.5 \times 1 \times 1 0 ^{22}}{6 \times 1 0 ^{23}}$
$= 4.158$

Q. The weight of 1×1022 molecules of CuSO4​.5H2​O is

41.59g

415.9g

4.159g