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11、有硅、铝和碳酸钙混和物.如果将该混和物溶于碱,则放出17.92升气体(标准状况)。用盐酸处理相同量的原始混和物也放出气体17.92升(标准状况)。将该混和气体通过氢氧化钙溶液,形成了16.2克碳酸氢钙.求混和物的质量组成。(答案:20克CaCO_3;10.8克Al;2.8克si) 12、将18克铁和铜的混和物同氯反应形成的盐用过量的碱处理,过滤沉淀,灼烧,得到12克黑色粉状物质。试求混和物的组成。(答案:9.6克Cu;8.4克Fe)
11. There is a mixture of silicon, aluminum and calcium carbonate. If the mixture is dissolved in a base, 17.92 liters of gas are evolved (standard conditions). Treatment of the same amount of the original mixture with hydrochloric acid also gave off 17.92 liters of gas (standard conditions). This mixed gas was passed through a calcium hydroxide solution to form 16.2 g of calcium hydrogen carbonate. The mass composition of the mixture was obtained. (Answer: 20 g of CaCO_3; 10.8 g of Al; 2.8 g of si) 12. Salt of 18 g of iron and copper mixed with chlorine is treated with an excess of alkali, filtered, and burned to give 12 g of black powder. substance. Try to find the composition of the mixture. (Answer: 9.6 g Cu; 8.4 g Fe)