What is the heat required to vaporize 650 grams of a liquid with a heat of vaporization of 723 joules/gram? a. 0.90 j b. 1.1 j c. 73 j d. 1,370 j e. 470,000 j

Which compound contains both ionic and covalent bonds? a) hbr b)cbr4 c)nabr d) naoh

Explain that newton first law,second law and third law of motion?

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?