中学生网络课堂本课配套习题挑战模式1/5
甲乙两种化合物均由X、Y两种元素组成，甲、乙中X元素的质量分数分别为30.4%和25.9%，若已知甲的化学式为XY2，则乙的化学式为
| A: X2Y5 |
| B: X5Y2 |
| C: X2Y3 |
| D: X3Y2 |
- 提示1：PHA+5YGH6K6+5LmZ55qE5YyW5a2m6K+V5pivWFk8c3ViPm48L3N1Yj7vvIxY55qE55u45a+55Y6f5a2Q6LSo6YeP5pivYe+8jFnnmoTnm7jlr7nljp/lrZDotKjph49i44CC5o2uWFk8c3ViPjI8L3N1Yj7kuK1Y5ZCr6YeP5Y+v5Lul5YiX5Ye65pa556iL5LiA44CCPC9wPg==
- 提示2：PHA+5o2uWFk8c3ViPm48L3N1Yj7kuK1Y5ZCr6YeP5YiX5Ye65pa556iL5LqM44CC6IGU56uL5Lik5pa556iL77yM5Y2z5Y+v6Kej5Ye6buWAvOOAgjwvcD4=
- 答案：QQ==
PHA+5YGH6K6+5LmZ55qE5YyW5a2m5byP5pivWFk8c3ViPm48L3N1Yj7vvIxY55qE55u45a+55Y6f5a2Q6LSo6YeP5pivYe+8jFnnmoTnm7jlr7nljp/lrZDotKjph49iPGJyPuaJgOS7pWEv77yIYSsyYu+8iT0zMC40JTxicj5hL++8iGErbmLvvIk9MjUuOSUg6IGU56uL5pa556iL77yM5rGC5b6Xbj0yLjU8YnI+5omA5LulWC9ZPTIuNe+8jOS5n+WwseaYr1g8c3ViPjI8L3N1Yj5ZPHN1Yj41PC9zdWI+PC9wPg==
本课配套习题挑战模式2/5
甲乙两种化合物都是由X、Y两种元素组成的，甲物质中含X元素50%，乙物质含Y元素为60%。已知甲物质的化学式为XY2，则乙物质的化学式为
| A: XY |
| B: X2Y |
| C: X2Y3 |
| D: XY3 |
- 提示1：PHA+6K6+WOWSjFnlhYPntKDnmoTljp/lrZDph4/liIbliKvkuLph5ZKMYuOAguWImeagueaNrueUsueJqei0qOS4rVjnmoTnmb7liIblkKvph4/lj6/liJflh7rmlrnnqIvjgII8L3A+
- 提示2：PHA+6K6+5LmZ54mp6LSo55qE57uE5oiQ5Li6IFg8c3ViPm08L3N1Yj5ZPHN1Yj5uPC9zdWI+77yM5qC55o2u5YW25LitWeWFg+e0oOeZvuWIhuWQq+mHj+WIl+WHuuaWueeoi+OAgjwvcD4=
- 提示3：PHA+5Lik5pa556iL6IGU56uL77yM5Y+v5Lul55qE5Ye6bTpu55qE5YC844CCPC9wPg==
- 答案：RA==
PHA+6K6+77yaWOWSjFnlhYPntKDnmoTnm7jlr7nljp/lrZDotKjph4/kuZ/liIbliKvkuLpY5ZKMWe+8jDxicj7liJnnlLLnianotKjkuK1Y55qE55m+5YiG5ZCr6YeP5Y+v5Lul6KGo56S65Li677yaPGJyPmEv77yIYSsyYu+8iT01MCU8YnI+6Kej5b6XIGE9MmI8YnI+6K6+5LmZ54mp6LSo55qE57uE5oiQ5Li6WDxzdWI+bTwvc3ViPlk8c3ViPm48L3N1Yj48YnI+5YW25LitWeWFg+e0oOeahOWQq+mHj+WPr+S7peihqOekuuS4uu+8mjxicj5uYi/vvIhtYStuYu+8iT02MCU8YnI+5oqKYT0yYuS7o+WFpe+8jDxicj7op6Plvpdt77yabj0gMe+8mjM8YnI+5omA5Lul77yM5LmZ54mp6LSo55qE5YiG5a2Q5byP5Li6WFk8c3ViPjM8L3N1Yj7jgILmraPnoa7nrZTmoYjkuLpE44CCPGJyPjwvcD4=
本课配套习题挑战模式3/5
由X,Y两种元素组成的两种化合物甲与乙。甲的化学式子为XY2，其中X的质量分数为44%，若化合物乙中X的质量分数为34.4%，则乙的化学式为
| A: XY3 |
| B: XY2 |
| C: XY |
| D: X3Y |
- 提示1：PHA+55Sy5Lit77yMeDQ0Je+8jHk1NiXvvIzliJl45ZKMeeeahOebuOWvueWOn+WtkOi0qOmHj+avlOS4ujQ077yaNTYvMj0xMTo3PC9wPg==
- 提示2：PHA+5LmZ5Lit77yMeDM0LjQl77yMeTY1LjYl77yMeOWSjHnljp/lrZDnmoTkuKrmlbDmr5TkuLozNC40LzExOjY1LjYvN+KJiDE6MzwvcD4=
- 答案：QQ==
PHA+55Sy5Lit77yMeDQ0Je+8jHk1NiXvvIzliJl45ZKMeeeahOebuOWvueWOn+WtkOi0qOmHj+avlOS4ujQ077yaNTYvMj0xMTo3PGJyPuS5meS4re+8jHgzNC40Je+8jHk2NS42Je+8jHjlkox55Y6f5a2Q55qE5Liq5pWw5q+U5Li6MzQuNC8xMe+8mjY1LjYvN+KJiDE6Mzxicj7liJnkuZnnmoTljJblrablvI/kuLpYWTxzdWI+Mzwvc3ViPuOAgjxicj48L3A+
本课配套习题挑战模式4/5
有X和Y两种元素，它们相互化合能形成甲、乙两种化合物，已知甲中X的质量分数为75%，乙中X元素的质量分数为80%，若甲的化学式为XY4，则乙的化学式为
| A: XY2 |
| B: X2Y |
| C: XY3 |
| D: X2Y3 |
- 提示1：PHA+6K6+WCxZ55qE55u45a+55Y6f5a2Q6LSo6YeP5YiG5Yir5piveCx544CC5o2u55Sy5LitWOeahOi0qOmHj+WIhuaVsOWIl+WHuuaWueeoi+OAgjwvcD4=
- 提示2：PHA+6K6+5LmZ55qE5YyW5a2m5byP5pivWDxzdWI+bTwvc3ViPlk8c3ViPm48L3N1Yj7jgILmja7kuZnkuK1Y55qE6LSo6YeP5YiG5pWw5YiX5Ye65pa556iL44CCPGJyPjwvcD4=
- 提示3：PHA+6IGU56uL5Lik5pa556iL77yM5Y+v5b6X5Ye6bTpu55qE5YC844CCPC9wPg==
- 答案：Qw==
PHA+6K6+WCxZ55qE55u45a+55Y6f5a2Q6LSo6YeP5YiG5Yir5piveCx5PGJyPuKIteeUsueahOWMluWtpuW8j+S4ulhZPHN1Yj40PC9zdWI+LOWFtuS4rVjljaA3NSU8YnI+4oi0eC8oeCs0eSk9NzUlPTMvNDxicj7iiLR4PTEyeTxicj7orr7kuZnnmoTljJblrablvI/mmK9YPHN1Yj5tPC9zdWI+WTxzdWI+bjwvc3ViPjxicj7iiLXkuZnkuK1Y5Y2gODDvvIU8YnI+4oi0eG0vKHhtK3luKT04MO+8hT00LzU8YnI+4oi0eG09NHluPGJyPuKItG06bj00eS94PGJyPuKItXg9MTJ5PGJyPuKItG06bj00eS94PTR5LzEyeT0xOjM8YnI+4oi05LmZ55qE5YyW5a2m5byP5pivWFk8c3ViPjM8L3N1Yj7jgII8YnI+PC9wPg==
本课配套习题挑战模式5/5
在化合物X2Y和YZ2中，Y的质量分数为40%和50%，则X2YZ3中的Y的质量分数为
| A: 35% |
| B: 30% |
| C: 25% |
| D: 20% |
- 提示1：PHA+WDxzdWI+Mjwvc3ViPlnkuK1Z55qE6LSo6YeP5YiG5pWw5pivNDAl77yM5omA5LulWS/vvIgyWCtZ77yJPTQwJe+8jOWPr+axguWHulnkuI5Y5LmL6Ze055qE5q+U5L6L5YWz57O744CCPC9wPg==
- 提示2：PHA+WVo8c3ViPjI8L3N1Yj7kuK1Z55qE6LSo6YeP5YiG5pWw5pivNTAl77yM5omA5LulWS/vvIhZKzJa77yJPTUwJe+8jOWPr+axguWHulnkuI5a5LmL6Ze055qE5q+U5L6L5YWz57O744CCPC9wPg==
- 提示3：PHA+6YKj5LmI5ZyoWDxzdWI+Mjwvc3ViPllaPHN1Yj4zPC9zdWI+5Lit77yMWeeahOi0qOmHj+WIhuaVsOWwseaYr1kv77yIMlgrWSszWu+8ie+8jOaIkeS7rOWwhuW3sue7j+axguWHuueahOavlOS+i+WFs+ezu+WFqOmDqOS7o+WFpei/m+adpe+8jOWwseWPr+S7peeul+WHuuetlOahiOWVpn48YnI+PC9wPg==
- 答案：Qw==
PHA+WDxzdWI+Mjwvc3ViPlnkuK1Z55qE6LSo6YeP5YiG5pWw5pivNDAl77yM5omA5LulWS/vvIgyWCtZ77yJPTQwJe+8jOino+W+l++8mjRYPTNZPGJyPllaPHN1Yj4yPC9zdWI+5LitWeeahOi0qOmHj+WIhuaVsOaYrzUwJe+8jOaJgOS7pVkv77yIWSsyWO+8iT01MCXvvIzop6PlvpfvvJpZPTJaPGJyPumCo+S5iOWcqFg8c3ViPjI8L3N1Yj5ZWjxzdWI+Mzwvc3ViPuS4re+8jFnnmoTotKjph4/liIbmlbDlsLHmmK9ZL++8iDJYK1krM1rvvInvvIzlsIY0WD0zWeWSjFk9Mlrku6PlhaXvvIzljbPlj6/nrpflh7rvvJpZ55qE6LSo6YeP5YiG5pWwPVkvNFk9MjUlPC9wPg==
