Fe2o3 + h2 --> fe + h2o
a) what mass of hydrogen gas must be consumed to produe 10.0 g of iron metal?

b) what mass of iron(lll) oxide, fe2o3, must be consumed to prepare 2.50g of iron metal

A) 10.0g of Iron is  of Iron.

One mole of dihydrogen is required to form one mole of iron, hence you'll need  of dihydrogen.

B) Likewise : 2.50g of Iron is  of Iron, hence we'll need  of Fe2O3.

If the water vapor content stays the same and the temperature drops, then the relative humidity increases. its vise versa.if the water vapor content stats the same and the temperature rises, the relative humidity decreases. so, yes, i'd say that temperature and humidity have a strong relationship.

Hydrogen is the most abundant element on the periodic table..hope it .