Để khử hoàn toàn 4,56 gam hỗn hợp X gồm FeO, Fe2O3, Fe3O4 cần 0,075 mol H2. Mặt khác hòa tan hoàn toàn 4,56 gam hỗn hợp X trong dung dịch H2SO4 đặc nóng dư thu được V ml khí SO2 (đktc), Tính V.

Cobalt-60 is an artificial radioisotope that is produced in a nuclear reactor and is used as a gamma-ray source in the treatment of certain types of cancer. if the wavelength of the gamma radiation from a cobalt-60 source is 1.00 × 10-3 nm, calculate the energy of a photon of this radiation.

Arollercoaster car at the top of a hill has potential energy kinetic energy chemical energy light energy

Summarize possible ways in which phases of matter could combine to form a solution.