Question

Calculate molecular weight for HNO3,C6H6

Answer 1

Answer:

Molecular weight of HNO3

Molar mass of HNO3 is (1+14+3×16) g/mol = 63.

As we know, one mole contains 6.022×10^23 molecules.

Therefore, mass of 6.022×10^23 molecules is HNO3 is 63g.

Hence, mass of 3×10^21 molecules of HNO3 is ({3×10^21)×63}/(6.022×10^23) = 0.314g (up to 3 decimal).

Explanation:

Molecular weight of C6H6,

Molecular weight of C

6

H

6

=6×12+6×1=78g,

Mass of 1 molecule =

6.002×10

23

78

=12.94×10

−23

g=1.294×1