A chemist measures the energy change during the following reaction: 2Fe2O3(s) → 4FeO(s) + O2(g) ΔH= 560

Use the information to answer the following question. Calculate how much heat will be released or absorbed. Be sure your answer has the correct number of significant digits.

When the volume and number of particles of a gas are constant which of the following is also constant

List four observations that indicate that a chemical reaction may be taking place

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?