SSC MTS EXAM

SSC

CHEMISTRY

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: -The mass of water is $36g$. 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: -∴1.2044×1025 molecules and 20 moles are equivalent to 360 g of water.

Detailed explanation-3: -A glass of water, or 200 grams of water, therefore contains 6.6855 × 1024 water molecules.

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