How many molecules are in 5.23 grams of C6H6?

Answer 1

The molar mass of C2H6 is 30 {(12*2)+(1*6)}.

The number of moles(n)=mass/molar mass

n=9.3 g/ 30 g mol-1 =0.31 mol.

The number of molecules of C2H6 =n* Avogadro number(L)= 0.31*6.022*1023= 1.86682*1023

The no. of atoms in one mole of C2H6=8

The no. of atoms in 0.31 moles of C2H6=8*1.86682*1023 =14.93456*1023 =1.49*1024

Answer 2

1.0 mol C2H6 has 2.0 mole of carbon atoms in it.

1.0 mol = 6.02 x 1023 (same as 1.0 dozen = 12)

Therefore, there are 1.2 x 1024 mol C atoms in 1.0 mole of ethane.

(keeping your 2 significant figures)

Answer 3

For this you need the atomic (molecular) mass of C6H6. Take the number of moles and multiply it by the Atomic Mass. Divide by one mole for units to cancel. C6H6=78.1 grams

5.6 moles C6H6 × (78.1 grams) = 437.36 moles C6H6

Answer 4

1.405x10-2 * 6.022x10^23= 8.46091x10^21 molecules

sigfigs- 8.461x10^21 molecules of C6H6

Answer 5

62. 3 g C6H6 (1 mole C6H6/78.018 grams)(6 mole H/1 mole C6H6)(6.022 X 1023/1 mole H)

= 2.89 X 1024 hydrogen atoms

======================

Answer 6

0.273 grams C2H6O (1 mole C2H6O/40.068 grams)(6.022 X 1023/1 mole C2H6O)

= 4.10 X 1021 molecules of ( ethanol?/dimethyl ether? ) C2H6O

==================================

Answer 7

The number of molecules in 23,0 grams of C6H12 is 1,6457.10e23.

Answer 8

4.44 x10^24 atoms C

Answer 9

4.035x10^22 molecules of benzene

Answer 10

4.44×10^24 atoms of Carbon