Question

data?
M. In two moles of acetaldehyde
(CH CHO) calculate the following
a. Number of moles of carbon
b. Number of moles of hydrogen
c. Number of moles of oxygen
d. Number of molecules of acetaldehyde
(Ans.: A. 4 mol, B. 8 mol, C. 2 mol,
D. 12.044 x 1023 molecules )​

Answer 1

molecular mass of C2H4O= 12*2+1*4+16=44g

amount of acetaldehyde= 44*2= 88g

no. of molecules of acetaldehyde= no of moles * avogadro no

=2* 6.022*10^23

=12.044*10^23 molecules

Answer 2

Answer:

A. 4 mol, B. 8 mol, C. 2 mol,  D. 12.044 x 1023 molecules.

Explanation:

Since, the formula for acetaldehyde is CH3CHO.

And in the 1 mole of this acetaldehyde we see that 2 moles of carbon, 4 moles of hydrogen and 1 mole of oxygen.

Now, in the question we have 2 moles of acetaldehyde so, for two moles of acetaldehyde all of the components will be double.

Hence, the number of moles of carbon will be:-

= 4 mole.

Number of moles of hydrogen will be:-

= 8 mole.

Number of moles of oxygen will be = 2 mole.

We know that the molecular mass of C2H4O= 12*2+1*4+16=44g.

Hence the amount of acetaldehyde will be= 44*2= 88g .

So, the number of molecules of acetaldehyde will be number of moles multiplied by Avogadro number.

=2* 6.022*10^23 .

=12.044*10^23 molecules.

So, the number of molecules of acetaldehyde is 12.044 x 10^23 molecules.