question archive How many molecules of N204 are in 76
How many molecules of N204 are in 76
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How many molecules of N204 are in 76.3 g N204? The molar mass of N204 is 92.02 g/mol. O 5.54 x 1025 N204 molecules O 7.26 x 1023 N204 molecules O 1.38 x 1024 N204 molecules O 4.59 x 1025 N204 molecules O 4.99x 1023 N204 molecules
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Soln;-
given mass of N2O4 = 76.3 g
Molar mass of N2O4 = 92.02 g/ mol
number of moles of N2O4 = 76.3/92.02 mol
= 0.83 mol
So,number of molecules of N2O4 = number of moles of N2O4 × Avogadro Number
Number of molecules of N2O4= 0.83× 6.022× 10^(23)
= 4.99 × 10^(23)
Fifth option, • 4.99 × 10^(23) N2O4 molecules is correct.
