Question

How many moles are in 63 g of NH4 (molar mass= 18g)?

a. 2 moles
b. 1 moles
c. 3.5 moles
d. 5 moles

Answer 1

To answer this question, all you to do is to divide the mass by the molar mass and that should get you your moles.

`=63g\ NH_(4)\ x\ (1\ mol\ NH_(4))/(18g\ NH_(4))`

= 3.5 mol NH₄

Answer 2

`\qquad \qquad\huge \underline{\boxed{\sf Answer}}`

Here's the solution ~

`\qquad \sf  \dashrightarrow \: 18g = 1 \: mole`

`\qquad \sf  \dashrightarrow \: 1g = (1)/(18) \: moles`

`\qquad \sf  \dashrightarrow \: 63g = (1)/(18) * 63\: moles`

`\qquad \sf  \dashrightarrow \: 63g = (7)/(2) \: moles`

`\qquad \sf  \dashrightarrow \: 63g = 3.5 \: moles`

Correct choice is C