Hey, anybody here got insta​

Calculate the molar mass of aluminum oxide (al2o3). express your answer to four significant figures.

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?

Given the following at 25c calculate delta hf for hcn (g) at 25c. 2nh3 (g) +3o2 (g) + 2ch4 (g) > 2hcn (g) + 6h2o (g) delta h rxn= -870.8 kj. delta hf=-80.3 kj/mol for nh3 (g), -74.6 kj/mol for ch4, and -241.8 kj/mol for h2o (g)