Which reaction is endothermic?
2brcl mc019-1.jpg br2 + cl2 + 29.3 kj
2h2 + o2 mc019-2.jpg 2h2o + 572 kj
c + o2 mc019-3.jpg co2 + 394 kj
n2o4 + 59 kj mc019-4.jpg 2no2

219 grams of iron (iii) oxide reacts with excess carbon according to the reaction equation shown below. fe2o3 + c → fe + co2 after a scientist performs the chemical reaction they find the actual yield of iron to be 57.4 grams. calculate the percent yield of this chemical reaction.

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?

100mg magnesium reacts with 20ml of 1.0m hcl