Question

Number of moles in 2.8g of silicon ?

Answer 1

Answer:

0.1 mol

Explanation:

we know

1 mol of silicon = molar mass of silicon

i.e. 1 mol of silicon = 28 g of silicon ( molar mass of silicon is 28..)

So. ,by unitary method

28 g of silicon = 1 mol of silicon

1 g of silicon = 1/28 mol of silicon

2.8 g of silicon = 2.8/28 mol of silicon

= 0.1 mol of silicon

so No. of mol in 2.8 g of silicon is 0.1 mol.

hehe.