How many atoms in c2h5no2?

Answer 1

Did you mean 2 x 10 to the power 23? if so it should be typed as 2 x 10 ^ 23 The trinitro toluene, (T.N.T) C7H5(NO2)3 sample will have; 2 x 1023 x 7 for the Carbon atoms, plus; 2 x 1023 x 5 for the hdrogen atoms, plus; 2 x 1023 x 3 for the nitogen atoms, plus; 2 x 1023 x 2 x 3 for the oxygen. you just need to add together the individual totals to find your answer.

Answer 2

The answer to this type of question can always be obtained by adding all the subscripts, including a implicit subscript of 1 for atoms with no explicit subscript. In this instance, 2 + 5 + 1 + 2 = 10.

Answer 3

Use Avogadro's number.

7.24 X 10^24 molecules of C2H2 (1 mole C2H2/6.022 X 10^23)

= 12.0 moles of atoms

Answer 4

10