Có 2 dung dịch H2So4 A và B . Nếu 2dung dịch trộn lẫn theo tỉ lệ khối lượng 7 : 3 thì thu được dung dịch C có nồng độ 29 % . biết C% = 2,5 C% A . Tính C%A và C%B

10. according to the law of conservation of mass, how does the mass of the products in a chemical reaction compare to the mass of the reactants?

1. suppose a reaction mixture, when diluted with water, afforded 300 ml of an aqueous solution of 30 g of the reaction product malononitrile [ch2(cn)2], which is to be isolated by extraction with ether. the solubility of malononitrile in ether at room temperature is 20.0 g/100 ml, and in water is 13.3 g/100 ml. what weight of malononitrile would be recovered by extraction with (a) three 100-ml portions of ether and (b) one 300-ml portion of ether? suggestion: for each extraction, let x equal the weight extracted into the ether layer. in part (a), the concentration in the ether layer is x/100 and in the water layer is (30 x)/300; the ratio of these quantities is equal to k 20/13.3.

What type of matter is made of only one kind of atom