Calculate the mass for 3 moles of ammonia.

Answer: 51g

Explanation:

n = m/M (where 'n' is the number of moles, 'm' is the mass and 'M' is the molar mass)

n = 3 moles (Given in the question)

M = 17

(This is because nitrogen has a relative mass of 4u and hydrogen has a relative mass of 1u)

We can rearrange the equation and get that

n * M = m

Therefore, 3 * 17 gives you the mass of 3 moles of ammonia

Which is 51g.

Answer: 51g

Explanation:

To solve for the mass of 3 moles of ammonia (NH3), let's get the mass of 1 mole of ammonia (NH3)

1mole of ammonia (NH3) = 14 + (3x1) = 17g.

Therefore,

3 moles of NH3 = 3 x 17 = 51g