Hòa tan 8 gam NaOH (M= 40) vào nước thành một lít dung dịch ở nhiệt độ 25oC có tỉ khối d=1,08 g/ml. Tính nồng độ mol/l (CM), nồng độ % (C%) dung dịch NaOH trên. b. Tính pH của các dung dịch sau: NaOH 0,2M; HCl 0,05M và CH3COOH có nồng độ 0,6 M. Biết hằng số điện ly của dung dịch CH3COOH là Ka = 1,86.10-5

Many ionic compounds and a few highly polar covalent compounds are because they completely ionize in water to create a solution filled with charged ions that can conduct an electric current.

In medium-sized stars such as the sun, nuclear fusion almost always means the fusing of nuclei to form , but larger stars can produce elements as heavy as

The combustion of methane, ch4, releases 890.4kj/mol. that is, when one mole of methane is burned,890.4 kj are given off to the surroundings. this meansthat the products have 890.4 kj less than the reactants. thus, ah for the reaction = - 890.4 kj. a negative symbolforah indicates an exothermic reaction. ch (g) + 20 (g)> co2 (g) + 2 h0 (1); ah = - 890.4 kga) how much energy is given off when 2.00 mol of ch, are burned? b) how much energy is released when 22.4g of ch. areburned?