Please help with these two chemistry questions. Image attached.

The answer to your question is

Explanation:

Question 8

To find the mass of a compound if we have the number of moles, we must use the molar mass of that compound (g/mol) and use proportions or a rule of three to find the mass.

Solution: g/mol of Calcium carbonate

Question 9

Use a rule of three to find the answer

                      1 mol 22.4 L

                     0.98 moles  x

                      x = (0.98 x 22.4) / 1

                      x = 21.952 L ≈ 22 L

Solution: 22 L

where is the following

explanation:

answer: the value of enthalpy change will be -152.80 kj.

solution:

pressure = 1atm , temperature = = 298 k

given that pressure and temperature are same in both gases , the number of moles of both gases can be determined by the ideal gas equation.

according to reaction 3 moles no are reacting with 1 mol of ,then 0.49 mol of no will react with moles of ozone that is 0.16 moles of ozone. since, no is limiting reagent and is an excessive reagent.

enthalpy change for the reaction between the given volumes of the gases is :