Question

what will be the mass of 0.7 moles of ammonia​

Answer 1

Answer:

The mass of 0.7 moles of ammonia is 11.9 g

Explanation:

The molecular formula of ammonia is $NH_{3}$

One nitrogen atom and three hydrogen atoms are present in one ammonia molecule.

Therefore the molecular mass of ammonia($NH_{3}$) = 14 + 3 = 17

Number of moles = 0.7 moles

The molecular weight of a substance is equal to the mass of one mole of that substance.

we know that , number of moles(n) = given mass(m) ÷  molecular mass(M)

Therefore given mass(m)=number of moles × molecular mass

$m = n$× $M$

$m = 0.7$ × $17$ $= 11.9 g$

Answer 2

Mass of ammonia is calculated.

Step 1.

Moles = wt.in gm / molecular wt.

Moles given 0.7

Molecular weight= 17.

Step 2.

Wt in gm = moles ×molecular wt.

= 0.7×17

=11.9 gm

Final answer is 11.9 is the mass of 0.7 moles of ammonia.