In the decomposition potassium nitride, 10.65 g of nitrogen form. How much potassium nitride was present initially?

Explain.

Mass = 99.8 g

Explanation:

Given dа ta:

Mass of potassium nitride = ?

Mass of nitrogen produced = 10.65 g

Solution:

Chemical equation:

2K₃N→ 6K + N₂

Moles of nitrogen:

Number of moles = mass / molar mass

Number of moles = 10.65 g / 28 g/mol

Number of moles = 0.38 mol

Now we will compare the moles of nitrogen with potassium nitride.

N₂; K₃N

1 : 2

0.38 : 2*0.38 = 0.76

Mass of potassium nitride:

Mass = molar mass * number of moles

Mass = 131.3 g/mol * 0.76 mol

Mass = 99.8 g