Hòa tan 1,42 gam Na2SO4 và 3,42 gam Al2(SO4)3 vào nước được 500 ml dung dịch X. 1.Tính nồng độ mol/l các ion trong dung dịch X ? 2.Trộn 500 ml dung dịch X với 500 ml dung dịch BaCl2 0,02M. Tính khối lượng kết tủa thu được ?

Which position represents spring in the southern hemisphere? a) b) c) d)

Large helium-filled balloons are used to lift scientific equipment to high altitudes. what is the pressure inside such a balloon if it starts out at sea level with a temperature of 10.0ºc and rises to an altitude where its volume is twenty times the original volume and its temperature is – 50.0ºc ?

What is conserved in the reaction shown below? h2(g) + cl2 (g) --> 2hcl(g)a. mass onlyb. mass and moles onlyc. mass, moles, and molecules onlyd. mass, moles, molecules, and volume