26. (a) Calculate the number of atoms in 64g of oxygen gas. [O=16]

(b) Which has a greater number of atoms 10g of hydrogen gas or 10g of helium gas?

[H=1; He=4]

(c) Calculate the mass of 0.5 mole of oxygen gas. [O=16]

(d) Calculate the mass of 3.011 x 1023 atoms of carbon. [C=12]

(e) Calculate the mass of 10 moles of sodium chloride. [Na=23; CI=35.5]

Question

Chemistry

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23 August, 00:16

26. (a) Calculate the number of atoms in 64g of oxygen gas. [O=16]

(b) Which has a greater number of atoms 10g of hydrogen gas or 10g of helium gas?

[H=1; He=4]

(c) Calculate the mass of 0.5 mole of oxygen gas. [O=16]

(d) Calculate the mass of 3.011 x 1023 atoms of carbon. [C=12]

(e) Calculate the mass of 10 moles of sodium chloride. [Na=23; CI=35.5]

+4

Answers (1)

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Scott Ferguson · Answer 1

A. 64 g O2 (1 mole/32 g) (6.023x10^23molecules/mole) = 12.04x10^23 = 1.204x10^24

B. hydrogen 10 g/2 g/mol = (5 mol) 6.023 x 10^23

helium 10g/4g/mol = (2.5 mol) (6.023x10^23

C. 0.5molO2 x32 g/mol = 16g

D. (3.011 x10^23 atoms/6.023 x 10^23 atoms/mol) x (12g/mol) = 6g

E. (58.5g/mol) x 10 mol = 585 g