Cho 2,8g hỗn hợp CuO, MgO, Fe2O3tác dụng vừa đủ với 50 ml dd H2SO41M. Cô cạn dung dịch sau phản ứng thu được m gam muối khan. Giá trị của m là:

Melissa is interested in her family tree and how her family has changed over its many generations. melissa probably more closely resembles

How are isotopes of the same element alike?

How is electrolysis most commonly used to produce an energy source? a - splitting water molecules produces oxygen, which organisms breathe to fuel their bodies. b - splitting water molecules produces hydrogen gas, which is used to power machines through hydrogen fuel cells. c - splitting carbon dioxide molecules produces coal, a form of carbon that can be burned to produce heat. d - splitting carbon dioxide molecules produces natural gas, which can be burned to generate electricity in power plants.