What is the molar mass of CH4?
(C = 12.01 g/mol, H = 1.008 g/mol)

The molar mass of CH4 is 16.042 g

C= 12.01 g/mol

H= 1.008 g/mol

The calculation can be done as follows

= 12.01 ₊ 1.008(4)

=12.01 ₊ 4.032

= 16.042

Hence the molar mass is 16.042 g

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The molar mass of CH4 (methane) is 16, 042 g/mol

Explanation:

We use the weight of the atoms C and H for calculate the molar mass:

Weight of CH4= weight C+ 4 x weight H= 12,01 g/mol +4 x 1,008g/mol=

Weight of CH4 =16, 042 g/mol

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e