3. Consider the following reaction: 2 Al + 6 HBr -2 AlBr3 + 3 H2
When 4.17 moles of Al reacts with 7.52 moles of HBr, how many moles of H2 are formed? (Type
out all work)
What is the limiting reactant? (Type out all work)

Aballoon inflated with three breaths of air has a volume of 1.7 l. at the same temperature and pressure, what is the volume of the balloon if five more same-sized breaths are added to the balloon? a balloon inflated with three breaths of air has a volume of 1.7 l. at the same temperature and pressure, what is the volume of the balloon if five more same-sized breaths are added to the balloon?

Which statement best describes the relationship between period and frequency of light waves? a) in wave b the period increases and the frequency decreases from wave a. b) in wave a the period increases and the frequency decreases from wave b. c) in wave b the period is shorter and the frequency is greater than in wave a. d) in wave a the period is shorter and the frequency is greater than in wave b.

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.