PLEAS HURRYY What volume is occupied by 3.12 moles of a gas when the pressure is 88.4 kPa at a temperature of 19℃?

How do you identify the anode on a power source such as a battery? how do you identify the cathode? how are terms anion and cation?

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?

Is this correct if not can u correct me