Plz help ASAP this is due today. 1) What is the approximate volume of 280 g of chlorine gas (Cl2) at STP?

A) 7.9 L
B) 22 L
C) 88 L
D) 180 L

2) 1 molecule of hydrogen+ 1 molecule of chlorine = 2 molecules of hydrogen chloride.
A) 2H+2CI=H2CI2
B) 2H+2CI=2HCI
C) H2+CI2=H2CI2
D) H2+CI2=2HCI

The two naturally occurring isotopes of chlorine are 35cl (34.969 amu, 75.77%) and 37cl (36.966 amu, 24.23%). the two naturally occurring isotopes of bromine are 79br (78.918 rm amu, 50.69%) and 81br (80.916 amu, 49.31%). chlorine and bromine combine to form bromine monochloride, brcl. 1. how many peaks will be present in a mass spectrum for brcl? the four combinations of molecule possible given these four isotopes are: 81br37cl, 81br35cl, 79br37cl, and 79br35cl. 2. what are the masses of the four different brcl molecules? express the masses using six significant figures, in decreasing numeric order (highest to lowest), separated by commas.