Question

Calculate the ratio by mass of the combining elements in given compounds Carbon
monoxide CO and Methane CH4.
​

Answer 1

Answer:

CO = 12+16 = 28g

CH4 = 12+4 = 16g

28:16

=7:4

Answer 2

Concept:

• Ratio by mass
• Compounds
• Calculating molar masses

Given:

• Carbon monoxide CO
• Methane CH4
• Mass of carbon C = 12 u
• Mass of oxygen O = 16 u
• Mass of hydrogen H = 1 u

Find:

• The ratio by mass of the combining elements in carbon monoxide CO and methane CH4

Solution:

Ratio by mass of CO = mass of C in the molecule: mass of O in the molecule

= 12: 16

= 3: 4

Ratio by mass of CH4 = mass of C in the molecule: mass of H in the molecule

= 12: 4

= 3: 1

The ratio by mass is 3: 4 and 3: 1 in carbon monoxide CO and methane CH4 respectively.

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