Calculate the number of molecules present in each of the following samples: i) 7

Question

Calculate the number of molecules present in each of the following samples: i) 7.45x10-3 mol of phosphine, PH3 ii) 7.45 g of phosphine, PH3 iii) a sample of benzene, C6H6, which contains a total of 4.50 mol of carbon Calculate the number of molecules present in each of the following samples: i) 7.45x10-3 mol of phosphine, PH3 ii) 7.45 g of phosphine, PH3 iii) a sample of benzene, C6H6, which contains a total of 4.50 mol of carbon i) 7.45x10-3 mol of phosphine, PH3 ii) 7.45 g of phosphine, PH3 iii) a sample of benzene, C6H6, which contains a total of 4.50 mol of carbon

Explanation / Answer

1 mole of any substance contains 6.023*1023 molecules

7.45*10-3 moles contains 7.45*10-3* 6.023*1023 molecules=44.87*1020 molecules

ii) Molecular weight of PH3= 34

Moles of PH3 in 7.45 gm of PH3= 7.45/ 34= 0.22 moles

1 mole of any substance contains 6.023*1023 molecules

0.22 moles contains 0.22*6.023*1023molecules =1.32*1023 molecules

iii) 1 mole of Benzene 6 moles of Carbons

4.5 moles of Carbon correspond tp 4.5/6 = 0.75 moles of Benzene

1 mole of any substance contains 6.023*1023 molecules

0.75 moles contains 0.75*6.023*1023 =4.52*1023 molecules

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