find the number of atoms in 2.8 liters of HCL
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48.176 it may help you
22.4 lit of HCl contains 6.022 * 10^23 atoms
Therefore
1 lit of HCl contains = 6.02*10^23/22.4 atoms
Therefore
2.8 lit of HCl contains = 6.02*10^23 * 2.8/22.4
= 7.5275*10^18 atoms