作业帮化学啊!3.When a 1.33 g sample of MgCrO4·xH2O is heated to remov
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化学啊!
3.When a 1.33 g sample of MgCrO4·xH2O is heated to remove all water, a mass of 0.701 g remains. Determine the value of x and report it in the answer box below. Only answers that are integers are allowed.
3.When a 1.33 g sample of MgCrO4·xH2O is heated to remove all water, a mass of 0.701 g remains. Determine the value of x and report it in the answer box below. Only answers that are integers are allowed.
MgCrO4·xH2O ——MgCrO4+xH2O
140+18x 140 18x
1.33 0.701
（140+18x）/1.33=140/0.701
x=7
再问： 1.(8.41×101 - 7.7×101) / (8.26×101 + 5.98×102) 的有效数字怎么个求法啊 2.An organic compound containing only C, H and Cl was found to contain 24.6 % by mass carbon and 2.75 % by mass hydrogen. Determine the empirical formula of the compound and enter the subscripts in the appropriate spots below. 是不是C5H7Cl5 没看明白这个Cl是一个啊还是100减去他们剩下的 谢谢大哥
140+18x 140 18x
1.33 0.701
（140+18x）/1.33=140/0.701
x=7
再问： 1.(8.41×101 - 7.7×101) / (8.26×101 + 5.98×102) 的有效数字怎么个求法啊 2.An organic compound containing only C, H and Cl was found to contain 24.6 % by mass carbon and 2.75 % by mass hydrogen. Determine the empirical formula of the compound and enter the subscripts in the appropriate spots below. 是不是C5H7Cl5 没看明白这个Cl是一个啊还是100减去他们剩下的 谢谢大哥
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