一个3o十多的把一个3岁多咬一口地球的有毒吗

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this.p={ dwrMethod:'queryLikePosts',fpost:'1d6b501a_9e64260',userId:,blogListLength:30};(1)油炸食物不宜多吃,因为长时间煎炸会产生有毒物质丙烯醛(C 3 H 4 O).丙烯醛的相对分子质量为______.(2)举重运动员在举重前常用一种白色粉末搓手,这种白色粉末的主要成分是MgCO 3 ,MgCO 3 中碳元素的质量分数为______(&精确到0.1%).(3)在电解水的实验中,电解器正极端的玻璃管收集了2mL气体,则其负极端的玻璃管收集气体的体积是______mL.(4)“笑气”是一种氮的氧化物,在医疗上曾用作麻醉剂,它的相对分子质量为44,氮与氧两种元素的质量比为7:4.“笑气”的化学式为______.
爱就一辈子0262
(1)丙烯醛的相对分子质量为12×3+1×4+16=56;(2)MgCO 3 中碳元素的质量分数为
24+12+16×3
≈14.3%;(3)电解水实验负极生成的是氢气,正极生成的是氧气,且氢气和氧气的体积比是2:1,所以负极端的玻璃管收集气体的体积是4mL;(4)设氧化物的化学式是NxOy,氮与氧两种元素的质量比为7:4,则有14×x:(16×y)=7:4,解得x:y=2:1,因为该氧化物的相对分子质量为44,所以“笑气”的化学式为N 2 O;故答案为:(1)56;&(2)14.3%;&&(3)4;(4)N 2 O.
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