Question

6. Calculate number of Mole
a)6gC
b)36gH2O
c)17gNH3
d)2gH2

Please answer.​

Answer 1

Answer:

Correct option is

B

4

NH

3

Molecular weight = 14+3×1

=17

No. of moles =

molecularweight

gramweight

=

17

68

(given)

=4mol

Answer 2

Answer:

a) 0.5 Mole

b) 2 Mole

c) 1 Mole

d) 1 Mole

Explanation:

Number of Moles =n

Given Mass =m

Molar Mass =M

Given number of particle =N

Avogadro number of particles=Na

a) 6gC

Ans :- Atomic mass of C=12u

Molar mass of C =12g

Thus, the number of moles

=given mass

molar mass

=>n = m = 6 = 0.5 Mole

M 12

b) 36gH2O

Ans :- Atomic mass of H2O=18u

Molar mass of H2O =18g

Thus, the number of moles

=given mass

molar mass

=>n = m = 36 = 2 Moles

M 18

c) 17gNH3

Ans :- Atomic mass of NH3 =17u

Molar mass of NH3 =17g

Thus, the number of moles

=given mass

molar mass

=>n = m = 17 = 1 Mole

M 17

d) 2gH2

Ans :- Atomic mass of H2=2u

Molar mass of H2 =2g

Thus, the number of moles

=given mass

molar mass

=>n = m = 2= 1 Mole

M 2

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