中学生网络课堂本课配套习题挑战模式1/4
现有16g Fe2O3和CuO的混合物，进行如下实验；把混合物全部加入到100g足量的硫酸溶液中，完全溶解，然后滴加150 g 16 %的氢氧化钠溶液，沉淀质量不再改变。试计算所用硫酸溶液溶质的质量分数为____
| A: 28.3% |
| B: 32.6% |
| C: 29.4% |
| D: 42.3% |
- 提示1：PFA+5q2k6aKY55qE6Kej6aKY5YWz6ZSu5Li76KaB5piv5om+5Ye6TmE8U1VQPis8L1NVUD7lkoxTTzxTVUI+NDwvU1VCPjxTVVA+Mi08L1NVUD7kuYvpl7TnmoTlhbPns7vvvIznlLHkuo7ml6DorrrlvIDlp4vmgI7kuYjlj43lupTvvIzmnIDlkI7liqDlhaXmsKLmsKfljJbpkqDku6XlkI7vvIzpg73mmK/pkqDnprvlrZDlkoznoavphbjmoLnnprvlrZDnu5PlkIjkuLrnoavphbjpkqDvvIzmiYDku6XmnIlIPFNVQj4yPC9TVUI+U088U1VCPjQ8L1NVQj7vvZ4yTmFPSO+8jOeEtuWQjuagueaNrui/meS4gOWFs+ezu+ino+mimOWNs+WPr+OAgjwvUD4=
- 答案：Qw==
PFA+PElNRyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzM5LzFDL3JCQUNFMU1XeEtQelNEMm9BQUFhUG1LQldMdzQxMi5wbmciIHdpZHRoPTQ5MCBoZWlnaHQ9MTgzIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMzkvMUMvckJBQ0UxTVd4S1B6U0Qyb0FBQWFQbUtCV0x3NDEyLnBuZyI+PC9QPg==
本课配套习题挑战模式2/4
铁具有可变的化合价，将14.4g草酸亚铁（FeC2O4）在隔绝空气的条件下加热分解，最终可得到7.2g铁的氧化物，则该铁的氧化物是_____
| A: Fe2O3 |
| B: FeO |
| C: Fe3O4 |
| D: 无法确定 |
- 提示1：PHA+5qC55o2u5YyW5a2m5Y+Y5YyW5YmN5ZCO5YWD57Sg6LSo6YeP5LiN5Y+Y77yMMTQuNGfojYnphbjkuprpk4HvvIhGZUM8c3ViPjI8L3N1Yj5PPHN1Yj40PC9zdWI+77yJ5Lit6ZOB5YWD57Sg55qE6LSo6YeP5Y2z5Li6Ny4yZ+mTgeeahOawp+WMlueJqeS4remTgeWFg+e0oOeahOi0qOmHj++8jOeUseatpOWPr+iuoeeul+WHuumTgeeahOawp+WMlueJqeS4remTgeS4juawp+S4pOWFg+e0oOeahOi0qOmHj+avlO+8jOWGjeeUsei0qOmHj+avlOiuoeeul+WHuuWOn+WtkOS4quaVsOavlOiAjOehruWumueJqei0qOeahOWMluWtpuW8jzwvcD4=
- 答案：Qg==
PHA+PGltZyBzcmM9Imh0dHBzOi8vcDIucWluZ2d1by5jb20vRzEvTTAwLzM0LzI2L3JCQUNFMU1TLUZQaGFqNE1BQUF0OWhXckFvTTY4LmpwZWciIGRhdGEtY2tlLXNhdmVkLXNyYz0iaHR0cHM6Ly9wMi5xaW5nZ3VvLmNvbS9HMS9NMDAvMzQvMjYvckJBQ0UxTVMtRlBoYWo0TUFBQXQ5aFdyQW9NNjguanBlZyIgaGVpZ2h0PSIxMDQiIHdpZHRoPSI1NTQiPjwvcD4=
本课配套习题挑战模式3/4
| A:2400 |
| B:2100 |
| C:2000 |
| D:2500 |
- 提示1：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
- 答案：QQ==
PGltZyB3aWR0aD01NTQgaGVpZ2h0PTE3MCBzcmM9Imh0dHBzOi8vcDEucWluZ2d1by5jb20vRzEvTTAwLzExLzA5L3JCQUNGRk1TLUV1eENWNUlBQUF2T0JXdkxHODEzLmpwZWciPg==
本课配套习题挑战模式4/4
将铜和活泼金属R的合金5g，放入25 g 20 %的稀盐酸中，恰好完全反应，经测定R的氯化物中氯元素的质量分数为52.2%，则样品中金属R的质量分数约为
| A: 96% |
| B: 89% |
| C: 45% |
| D: 29% |
- 提示1：PHA+5qC55o2u6LSo6YeP5a6I5oGS5a6a5b6L77yM5YyW5a2m5Y+N5bqU5YmN5ZCO5YWD57Sg55qE56eN57G75ZKM6LSo6YeP5LiN5Y+Y77yM5rGC5Ye6MjVnIDIwJeeahOebkOmFuOS4reawr+WFg+e0oOeahOi0qOmHj+S5n+WwseaYr+axguWHuueUn+aIkOeahOebkOS4reawr+WFg+e0oOeahOi0qOmHj++8jOi/m+iAjOaxguWHuueUn+aIkOeahOebkOS4rVLlhYPntKDnmoTotKjph4/vvIzkuZ/lsLHmmK/ph5HlsZ5S55qE6LSo6YeP77yM5pyA5ZCO5qC55o2uUueahOi0qOmHj+mHkeWxnuagt+WTgeeahOi0qOmHj8OXMTAwJeaxguWHuuagt+WTgeS4rVLnmoTotKjph4/liIbmlbDjgII8YnI+PC9wPg==
- 答案：Qg==
PHA+6Kej77ya55uQ6YW45Lit5rCv5YWD57Sg55qE6LSo6YePPTI1Z8OXMjAlw5czNS41w7czNi41PTQuODNnPGJyPjwvcD48cD7nlJ/miJDnmoTnm5DkuK3msK/lhYPntKDnmoTotKjph4/liIbmlbDkuLo1Mi4yJe+8jOWImeeUn+aIkOeahOebkOS4rVLlhYPntKDnmoTotKjph4/liIbmlbDkuZ/kuLo0Ny44Je+8jDxicj7nlJ/miJDnmoTnm5DkuK1S5YWD57Sg55qE6LSo6YeP5Li677yaNC44NjNnw5c0Ny44JcO3NTIuMiU9NC40NTNnPGJyPuagt+WTgeS4rVLnmoTotKjph4/liIbmlbA9NC40NTNnw7c1ZyDDlzEwMCU9ODklPGJyPjwvcD48cD7mlYXpgIlCPGJyPjwvcD4=
