Question

Calculate the no. Of molecules in 8g of H2O

Answer 1

Answer:

2.676×10²³

Explanation:

molecular mass of H2O is

1(2) + 16(1) = 2+16 = 18 g

18 grams have 6.023×10²³

then 8 grams have

=8 (6.023×10²³) / 18

= 2.676×10²³

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Answer 2

Answer:

$\red\displaystyle{\implies \ 2.74\times10^{23} \ molecules}$

Explanation:

$\displaystyle{Given \ mass=8g}\\\\\\\displaystyle{Molar \ mass \ of \ water \ or \ H_2O=18g}\\\\\\ \displaystyle{We \ know \ ;}\\\\\\\displaystyle{No. \ of \ moles=\frac{Given \ mass}{Molar \ mass}}\\\\\\\displaystyle{putting \ values}\\\\\\\displaystyle{No. \ of \ moles=\frac{8 \ g}{18 \ g}}\\\\\\\displaystyle{No. \ of \ moles=0.44 \ moles.}$

$\displaystyle{We \ know \ ;}\\\\\\\displaystyle{One \ mole \ contains \ 6.022\times10^{23} \ molecules}\\\\\\\displaystyle{0.44 \ moles \ contains \ ;}\\\\\\\displaystyle{\implies \ 0.44\times6.022\times10^{23} \ molecules}\\\\\\\displaystyle{\implies \ 2.736\times10^{23} \ molecules}\\\\\\\displaystyle{\implies \ 2.74\times10^{23} \ molecules}$

Thus , we get answer.