The initial pressure of 0.31 moles of gas in a drum is 742 torr. If gas is added to the drum and the final pressure is 759 torr, how many moles of gas are in the drum? Hint: for this problem, you do not have an equation in the Introduction section, but based on the relationship between pressure and volume, what can you determine about the relationship between pressure and the number of moles?

0.32 mole

Explanation:

From the question given above, the following data were obtained:

Initial mole (n₁) = 0.31 mole

Initial pressure (P₁) = 742 torr

Final pressure (P₂) = 759 torr

Final mole (n₂) =?

The final mole of the gas in the drum can be obtained as follow:

P₁/n₁ = P₂/n₂

742 / 0.31 = 759 / n₂

Cross multiply

742 × n₂ = 0.31 × 759

742 × n₂ = 235.29

Divide both side by 742

n₂ = 235.29 / 742

n₂ = 0.32 mole

Thus, the final mole of the gas in the drum is 0.32 mole

"the periodic table is arranged in order of atomic number."

answer : a model is often used to explain and make things easier to understand when any scientific topic needs to be demonstrated and explained.

as in this case where a scientist wants to use a model to present the results of his detailed scientific investigation. he should do it as it will him to make the audience understand the concept in a much better way. also, it can be changed according to new scientific understandings.