Question

13. What is the mass of
(a) 6.02x1023 atoms of oxygen
(b) 6.02x1023 molecules of P4
(c) 3.01x1023 molecules of O2​

Answer 1

Explanation:

a)

$6.02 \times 10 {}^{23} = 1 \: mole$

Mass of 1 mole of oxygen = 8g

b)

$6.02 \times 10 {}^{23} = 1 \: mole$

Mass of 1 mole of P4 = 15 * 4 = 60

c)

$3.01 \times 10 {}^{23} = 1 \div 2 \: mole$

Mass of 1/2 mole of O2 = 8g

Answer 2

Answer:

(a)8g
(b)60g

(c)8g

Explanation:

(a) mass = given mass/Avogadro's no  

=6.02x10^23             x  16

 6.022x10^23

=1/2 x 16 =8g

(b)6.02x10^23             x  30

 6.022x10^23

=1/2 x 30 = 15 =15x4(cause theres 4 atoms in P4) = 60

(c) 6.02x10^23             x  32  = 1/2 x 32 = 16

    6.022x10^23

But the number given here is 3.01x10^23 so ,

• 3.01x10^23/6.022x10^23 x 16 = 1/2 x 16
  = 8g