Question

please answer all my questions please

please help me​

Answer 1

Answer:

1. No. of moles=Mass in grams/Molar mass

                       =4/1

                       =4 mol

 ∴No. of molecules=No. of moles × Na

                               =4 × 6.022 × 10^23

2.  No. of moles=44/44

                          = 1 mol

         Volume at STP=No. of moles × 22.4

                                  =22.4 L

3. No of moles=71/71

                        =1 mol

4. Zinc combines with dilute hydrochloric acid to give zinc chloride and hydrogen gas