The molar heat of vaporization of water is 40.7kj/mol. how much heat must be absorbed to convert 50.0 grams of liquid water at 100oc to steam at 100oc?

a) 1.46 x 10 kj
b) 1.13 x 102kj
c) 2.04 x 103kj
d) 3.66 x 104kj

Write the symbol for every chemical element that has atomic number greater than 3 and atomic mass less than 12.0 u.

Joan writes four numbers on the board in standard form, and then she writes their scientific notation

Cryolite, na3alf6(s), an ore used in the production of aluminum, can be synthesized using aluminum oxide. start this question by first balance the chemical equation.1.) balance the equation: - alo3(s)+naoh(l)+hf(> na3alf6+h2o(g). 2.) if 17.5 kilograms of al2o3(s), 51.4 kilograms of naoh(l), and 51.4 kilograms of hf(g) react completely, how many kilograms of cryolite will be produced? 3.)which reactants will be in excess, (al2o3, naoh, or hf) 4.)what is the total mass of the excess reactants left over after the reaction is complete in kg?