Manganese can be extracted from its ore, hausmannite, by heating with aluminum. 3Mn3O4+ 8Al → 4Al2O3+ 9Mn
23 tonnes of ore is processed, and 200.0 kg of manganese obtained. Calculate the percentage by mass of Mn3O4 in the ore.

You just calculated that the heat of fusion for chloromethane is 6400 j/mol. the heat of fusion for hydrogen is 120 j/mol.? which of the following account for this difference? more than one correcta. chloromethane can absorb more energy at the same temperature. b. hydrogen has stronger intermolecular forces than chloromethane. c. hydrogen molecules can pack more closely than chloromethane molecules. d. chloromethane experiences dipole-dipole interactions. e. chloromethane has a higher molar mass than hydrogen.

Ascientist conducted an experiment and discovered that certain plants grow faster when given a particular amount of fertilizer. anouther scientist conducted the same experiment and got similar results. which concept does this best illustrate? a) repetition b) replication c) precision d) validity

What is dhmo? hint: you find it everywhere something is wet..