PLEASE HELP 2. A 20.0 gram sample of oxygen gas (O2) is collected at 27 oC and 0.910 atm. What volume of oxygen is this?
A.16.9 L
B.1.22 L
C.1.52 L
D.20.9 L

4.What is the molecular weight of a gas with a density of 1.20 g/L at 750 mmHg and 20 oC?

A. 9.20 g/mol
B.19.2 g/mol
C.49.2 g/mol
D.29.2 g/mol

Which statements describe polyatomic ions? check all that apply. polyatomic ions have many charges. polyatomic ions have one overall charge. polyatomic ions repel other ions to form ionic bonds. polyatomic ions attract other ions to form ionic bonds. polyatomic ions are made up of only one type of atom. polyatomic ions are made up of two or more types of atoms.

What is the mass of sodium in 3 moles of sodium chloride

20 pts ‼️ an unmanned spacecraft travels to mars. mars has a lower strength of gravity than earth. where in the image is the spacecraft’s weight the greatest?