Question

Calculate the percent by mass of carbon in CO2 (carbon dioxide).

Answer 1

Answer:

Explanation:

% by mass of C = (mass of C/mass of CO2) X 100%

mass of C = 12

mass of CO2 = 12 + (16X2)

                      = 12 + 32

                      = 44

% by mass of C = (12/44) X 100% =27.2%

Answer 2

Answer:

The answer to your question is 27.3 %

Explanation:

Percent by mass = ?

Process

1.- Calculate the atomic mass of carbon using the periodic table

Atomic mass = 12g

2.- Calculate the molecular mass of CO₂.

Carbon = 12

Oxygen = 16 x 2 = 32

Total = 12 + 32 = 44g

3.- Calculate the percent by mass of carbon using proportions

                          44g -------------------- 100%

                           12 g -------------------  x

                            x = (12 x 100) / 44

                            x = 1200 / 44

                            x = 27.3 %