Question

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]

Answer 1

Answer:

Explanation:

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