If the mass of $ H_2O$ in a glass is $ 36g$ . then calculate the $ no. of moles$ if the $ molar mass$ of $ H_2O$ is $ 18g$ . HINT:use the following formula:$ No. of moles=frac{Mass in g}{Molar mass}$

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Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]

If the mass of

A	2 moles
B	0.5 moles
C	5 moles
D	None of the above

Explanation:

Detailed explanation-1: -Complete step by step answer: We know that the molecular mass of water is $18g/mol$. One can calculate the number of moles in a substance using the above formula. Hence, the number of moles in $36g$ of water is two moles.

Detailed explanation-2: -Therefore, in one mole of water (H2O), there are two moles of hydrogen atoms and one mole of oxygen atoms.

Detailed explanation-3: -Hence the number of moles of 32 grams of water is 1.77 moles.

Detailed explanation-4: -Water is made up of two hydrogen atoms and one oxygen atom. One mole of the water molecule has. 02 g this can be calculated by adding the masses of a number of atoms involved in the formation of the water molecule i.e. 2 hydrogen atoms and one oxygen atom. Mass of water = ( 2 × 1 . 008 ) + 16 .

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