Lithium oxide is used aboard the space shuttle to remove water from the atmosphere according to the equation
Li2O(s)+H2O(g)→2LiOH(s)
How many grams of Li2O must be carried on board to remove 70.0 kg of water?

Astudent reacts 13 moles of iron with 21 moles of oxygen according to the following equation:

Which of the following units is not an official si unit

Acalorimeter is to be calibrated: 51.203 g of water at 55.2 degree c is added to a calorimeter containing 49.783 g of water at 23.5c. after stirring and waiting for the system to equilibrate, the final temperature reached is 37.6 degree c. specific heat capacity of water (s = 4.18 j/g∙degree c). calculate the calorimeter constant. (smδt)warm water = -[(smδt)cold water + (calorimeterδtcold water)]