Question

(a) how many gram atoms are there in 10 gram of calcium?

(b)What weight of Ca contains same number of atoms as are present in 3.2g of S?

(c) calculate number of atoms in 52 amu of He?​

Answer 1

Explanation:

(1).10 gm of calcium = 10 * 6.022 * 1023 / 40 = 1 .

(2).Ca weigh =(40g)6.022×1023×6.022×1022=4g.

(3). Atomic mass of Helium is 4u = 2protons + 2 Neutrons = 1 atom. No. of atoms in 52u = 52/4 = 13 atoms.

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