8. A sample of a gas at 77°C and 1.33 atm occupies a volume of 50.3 L. How many
moles of the gas are present? (Hint: Since moles have been asked, which equation
has the moles listed in the equation. Use that to solve this problem).

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.

Density= mass/volume so 5.1 divided by 4.7 is  5.1 / 4.7 =1.08510638298round to the correct number of sig figs

Answer the same molecular formula;