Some Basic Concepts Of Chemistry Question 174

Question: The mass of a molecule of water is [Bihar CEE 1995]

Options:

A) $ 3\times {10^{-26}} $ kg

B) $ 3\times {10^{-25}} $ kg

C) $ 1.5\times {10^{-26}} $ kg

D) $ 2.5\times {10^{-26}} $ kg

Show Answer

Answer:

Correct Answer: A

Solution:

$ 6\times 10^{23} $ molecules has mass $ =18gm $

1 molecules has mass $ =\frac{18}{6\times 10^{23}} $ $ =3\times {10^{-23}}gm $

$ =3\times {10^{-26}}kg $ .



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