How many molecules of ch4 are in 48.2 g of this compound? a) 2.00 x 1023 b) 5.00 x 10-24 c)1.81 x 1024 d) 4.00 e) 4.64 x 1026 10) -

The correct answer is Option C.

Explanation:

To calculate the number of moles, we use the equation:

Given mass of methane = 48.2 g

Molar mass of methane = 16 g/mol

Putting values in above equation, we get:

According to mole concept:

1 mole of compound contains number of molecules.

So, 3.0125 moles of methane will contain = number of molecules.

Hence, the correct answer is Option C.

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