Answers

2015-11-18T00:28:51+05:30
Molecular mass of HCI is 36.5u
now no. of moles present in it is 3.46/36.5 = 0.0947
multiply this no with Avogadro no. and there you have your answer.
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2015-11-18T12:00:43+05:30
mass of HCl = 1 * 1 + 35.5 * 1 = 1 + 35.5 = 36.5 grams 
36.5 g = 6.022 * 10²³ molecules 
now ,
number of molecules = given mass / molar mass * Avogadro number 
⇒ N = 3.46 / 35.6 * 6.022 * 10²³
⇒ N = 0.94 * 6.022 * 10²³
⇒ N =5.66068 * 10²³
therefore number of molecules in 3.46 grams of HCl = 5.66068 * 10²³
      i hope it helps...............................^_^
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