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# Find (A) the Total Number and (B) the Total Mass of Neutrons in 7 Mg Of 14c - CBSE (Science) Class 11 - Chemistry

ConceptSubatomic Particles Discovery of Protons and Neutrons

#### Question

Find (a) the total number and (b) the total mass of neutrons in 7 mg of 14C.

(Assume that mass of a neutron = 1.675 × 10–27 kg).

#### Solution

ii (a) Number of atoms of 14C in 1 mole= 6.023 × 1023

Since 1 atom of 14C contains (14 – 6) i.e., 8 neutrons, the number of neutrons in 14 g of 14C is (6.023 × 1023) ×8. Or, 14 g of 14C contains (6.022 × 1023 × 8) neutrons.

Number of neutrons in 7 mg

= (6.022 xx 10^(23)xx8xx7 "mg")/(1400 "mg")`

= 2.4092 × 1021

Is there an error in this question or solution?

#### APPEARS IN

NCERT Solution for Chemistry Textbook for Class 11 (2018 to Current)
Chapter 2: Structure of Atom
Q: 2.2 | Page no. 65

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Solution Find (A) the Total Number and (B) the Total Mass of Neutrons in 7 Mg Of 14c Concept: Subatomic Particles - Discovery of Protons and Neutrons.
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