Question

The question given below consist of Assertion (A) & Reason (R). Use the following key to select the correct answer: (a) If both (A) & (R) are correct & (R) is the correct explanation of (A). (b) If both (A) & (R) are correct but (R) is not correct explanation of (A). (c) If (A) is correct but (R) is incorrect. (d) If (A) is incorrect but (R) is correct. 14) (A) The empirical mass of ethene is half of its molecular mass. (R) The empirical formula represents simplest whole no. ratio of various atom present in compound.

Answer 1

Explanation:

Given -

• Assertion and Reason

To Find -

• Which Option is correct?

Assertion :-

The empirical mass of ethene is half of its molecular mass.

Let's calculate the molecular mass first

molecular mass of C2H4 is

⇝12 × 2 + 1 × 4

⇝24 + 4

⇝28 g/mol

As we know that :-

The empirical formula represents simplest whole no. ratio of various atom present in compound.

Then,

Empirical formula of C2H4 is CH2

From here,

Empirical mass = 12 + 1×2

⇝14 g/mol

Now,

Molecular mass = n × empirical mass

⇝28 = n × 14

⇝n = 2

From here,

It's cleared that

Empirical mass of Ethene = molecular mass/2

It means,

Assertion is correct.

And

Reason :-

The empirical formula represents simplest whole no. ratio of various atom present in compound.

It is also true.

So,

Reason is correct.

Therefore,

Option A is correct.

Both Assertion and Reason are correct and Reason is correct Expalination of Assertion.