Chất nào sau đây được dùng để điều chế oxi trong phòng thí nghiệm? A. Fe2O3
B. CaCO3
C. H2SO4
D. KMnO4

Fossil fuels are organic compounds that are made from

Hydrogenation reactions, in which h2 and an "unsaturated" organic compound combine, are used in the food, fuel, and polymer industries. in the simplest case, ethene (c2h4) and h2 form ethane (c2h6). if 140 kj is given off per mole of c2h4 reacting, how much heat (in mj) is released when 12 kg of c2h6 forms?

Akno3 solution containing 51 g of kno3 per 100.0 g of water is cooled from 40 ∘c to 0 ∘c. what will happen during cooling?