Calculate the no. of molecules in one kg of calcium chloride.
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Solution
Given weight=1kg=1000g gram molecular weight of cacl2=40+71=111g no. of molecules=(given weight/gram molecular weight )*avagadro number avagadro number=6.023*10^23 No. of molecules=(1000/111)*6.023*10^23 =5.4*10^24