Question

Pls solove.. ....
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Answer 1

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Given :-

• No. of ${H_2\:O}$moles = 5

To find :-

• Mass of 5 moles of ${H_2\:O}$ (in g)

Solution :-

Atomic mass of H = 2 × 1 = 2

Atomic mass of O = 1 × 16 = 16

Atomic mass of ${H_2\:O}$ = Atomic mass of H + Atomic mass of O

Molecular mass mass of ${H_2\:O}$ = 2 + 16 = 18

Let's apply the formula,

No. of moles in ${H_2\:O}$ = $\bf\large\frac{Mass\:of\:H_2O\:in\:gram}{Molecular\:mass\:of\:H_2O}$

Plug the values in the formula,

5 = $\bf\large\frac{Mass\:of\:H_2O\:in\:grams}{18}$

We have to find the molecular mass of ${H_2\:O}$ , therefore,

Molecular mass of ${H_2\:O}$ = 5 × 18

Molecular mass of ${H_2\:O}$ = 90

•°• Mass of 5 moles of water = 90 g