Question

Calculate the moles of 90g H2O

Answer 1

H2O
H *2+ O*1
1*2+ 16*1
2 + 16
18u
therefore molar mass = 18g
number of moles = given mass / molar mass
number of moles = 90/ 18
number of moles = 5

Answer 2

Molecular mass of H20
= (1×2)+(1×16)
= 18 gm

given mass = 90 gm

No. of moles = given mass in gram/molecular mass
= 90/18
= 30/6
= 5

hence 90 g of H20 contains 5 moles.

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