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

Answers

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.

[tex]=63g\ NH_{4}\ x\ \frac{1\ mol\ NH_{4}}{18g\ NH_{4}}[/tex]

= 3.5 mol NH₄

Answer 2

[tex]\qquad \qquad\huge \underline{\boxed{\sf Answer}}[/tex]

Here's the solution ~

[tex]\qquad \sf  \dashrightarrow \: 18g = 1 \: mole[/tex]

[tex]\qquad \sf  \dashrightarrow \: 1g = \dfrac{1}{18} \: moles[/tex]

[tex]\qquad \sf  \dashrightarrow \: 63g = \dfrac{1}{18} \times 63\: moles[/tex]

[tex]\qquad \sf  \dashrightarrow \: 63g = \dfrac{7}{2} \: moles[/tex]

[tex]\qquad \sf  \dashrightarrow \: 63g = 3.5 \: moles[/tex]

Correct choice is C


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