Question

Question No. 4 The atomic number of elements A and B are 14 and 8, respectively. If the total number of atoms of element A and element B provided is 50 and 40 respectively for a chemical reaction, what is the total number of molecules produced if they react with each other? O 40 30 O 25 G O 20​

Answer 1

Answer:

Explanation:

14)Silican

8)Oxygen

80 molecules

Answer 2

Answer:

The 4th option 20 is correct.

Explanation:

• The element which has atomic number 14 is Silicon (Si).
• The element which has atomic number 8 is Oxygen (O).
• We know that when oxygen and silicon react, we obtain SiO₂, O=Si=O.
• One atom of silicon makes bonds with two oxygen atoms. The ratio of silicon to oxygen in the molecule is 1:2.
• We are given 50 silicon atoms and 40 oxygen atoms. The number of silicon atoms required for pairing up with 2 oxygen atoms will be:

Silicon:Oxygen  1:2

For - 40 ÷ 2 = 20

We require only 20 silicon atoms to react with 40 oxygen atoms. The rest 30 atoms of silicon are in excess.

Conclusion:

The number of molecules produced are 20.