甲醛HCHO中碳元素質(zhì)量分數(shù)=12/30 = 40%
而甲醛的水溶液中,碳元素的質(zhì)量分數(shù)是10%
所以甲醛質(zhì)量分數(shù) = 10%/40% = 25%能寫出詳細過程嗎？？？這樣吧：設甲醛的質(zhì)量分數(shù)為x，則甲醛溶液的質(zhì)量分數(shù) * 碳元素在甲醛中的質(zhì)量分數(shù) = 碳元素在甲醛溶液中的質(zhì)量分數(shù)即：x * 12/30 = 10%解得x = 25%即甲醛溶液質(zhì)量分數(shù) = 10%/40% = 25%