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分子式和化学方程式计算是初中化学的重点内容。高中化学引入了摩尔、摩尔数、克当量及克当量数等概念,从而提出物质反应时的摩尔数比和克当量数比,这就使化学计算简便了。由于物质互相反应时,经常在水溶液中进行,因此,掌握溶液浓度的计算很重要。溶液浓度的实质就是一定量的溶质与一定量的溶液的比,比值的大小表示溶液浓稀的程度。在实际应用中计算物质间反应量时,要计算溶液中溶质的量,即将摩尔数、克当量数的计算与溶液体积、溶液重量
The calculation of molecular formulas and chemical equations is a key part of junior chemistry chemistry. High school chemistry introduces concepts such as moles, moles, gram equivalents, and gram equivalents to suggest molar ratios and equivalence ratios for the reaction of matter, which makes chemical calculations simpler. Since substances react with each other, often in aqueous solutions, it is important to understand the concentration of the solution. The essence of the solution concentration is the ratio of a certain amount of solute to a certain amount of solution, and the ratio of the ratio indicates the degree of thickening of the solution. When calculating the amount of inter-substance reaction in practical applications, calculate the amount of solute in the solution, that is, the calculation of the number of moles and gram equivalents, the volume of the solution, and the weight of the solution.