đốt cháy hoàn toàn 2,34g hỗn hợp gồm metyl axeta, etyl fomat và vinyl axetat rồi hấp thụ toàn bộ sản phẩm cháy vào dd Ca(OH)2 dư. sau thu được 10g kết tủa và dd X. khối lượng X so với khối lượng dd Ca(OH)2 ban đầu thay đổi như thế nào

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For a research project, a student decided to test the effect of the lead(ii) ion (pb2+) on the ability of salmon eggs to hatch. this ion was obtainable from the water‐soluble salt, lead(ii) nitrate, which the student decided to make by the following reaction. pbo(s) + 2 hno3(aq) → pb(no3)2(aq) + h2o losses of product for various reasons were expected, and a yield of 86.0% was expected. in order to have 5.00 g of product at this yield, how many grams of pbo should be reacted? (assume that sufficient nitric acid, hno3, would be used.)

110 g of water (specific heat = 4.184 j/g c) and 100 g of a metal sample (specific heat = 0.397 j/g c) are heated from 25 degrees c to 75 degrees c. which substance required more thermal energy?