Question

One mole of proton neutron in milligrams

Answer 1

Answer:

(i) 1 mole of methane (CH4) = 1 mole of C + 4 × 1 mole of H

we know,

1 mole of C = 6 mole of electrons

1 mole of H = 1 mole of electron

so, 1 mole of CH4 = 6 + 4 = 10 mole of electrons

but 1 mole = 6.022 × 10²³

so, 1 mole of CH4 = 10 × 6.022 × 10²³ electrons

= 6.022 × 10²⁴ electrons

Explanation:

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Answer 2

(ii) Find (a) the total number and (b) the total mass of neutrons in 7 mg of

14

C.

(Assume that mass of a neutron =1.675×10

−27

kg).

(iii) Find (a) the total number and (b)

ANSWER

(i) Total number of electrons present in 1 methane molecule =6+4=10.

Total number of electrons resent in 1 mole of methane =10×6.023×10

23

=6.023×10

24

electrons.

The number of neutrons is equal to the difference in the mass number and atomic number.

It is equal to $$\d

isplaystyle 14-6=8 $$.