Question

A solid of molecular mass 100 amu weighs 2 g .calculate (1) number of moles (2) number of molecules in the solid

Answer 1

Answer:

Explanation:

Molecular mass = 100amu

Therefore molar mass = 100g

Number of moles= Weight of substance/ Molar mass

= 2/100 = 1/50 = 0.02 moles

I mole contains 6.022 × 10^23 molecules

So, 0.02 miles will contain ---> 0.02 × 6.022 × 10^23 = 1.2 × 10^22 molecules

Answer 2

Answer:

 

Explanation:Molecular mass = 100amu

Therefore molar mass = 100g

Number of moles= Weight of substance/ Molar mass

= 2/100 = 1/50 = 0.02 moles

I mole contains 6.022 × 10^23 molecules

So, 0.02 miles will contain ---> 0.02 × 6.022 × 10^23 = 1.2 × 10^22 molecules