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 orbitals form a pi bond? a.the s orbital and three p orbitals b.the s orbital and two p orbitals c.overlapping p orbitals d.overlapping hybrid orbitals

Which of these conditions most likely produces an unstable isotope?

The human eye contains a molecule called 11-cis-retinal that changes shape when struck with light of sufficient energy. the change in shape triggers a series of events that results in an electrical signal being sent to the brain that results in vision. the minimum energy required to change the conformation of 11-cis-retinal within the eye is about 164 kj/mol.