Question

mass of water is expressed in - option- a) gms, b) lb, c) ounce, d) Newton

Answer 1

Mass of water is expressed in gms.

Hope it helps...

Answer 2

Mass of water is expressed in gms.

Explanation:

1. Lb is the unit which is used in the measurement of weight. It means pounds.

2. The unit ounce can be used in measuring weight, volume and mass.

3. Newton is the unit to measure force on or by a object or body.

4. Let us calculate the mass of one molecule of water. We know that a water molecule consists of two hydrogen atoms and one oxygen atom.

Number of molecules in 1 H2O molecule=

$6.022 \times {10}^{23}$

Therefore, molecular mass of H20=

$2 \times 1 + 1 \times 16$

$2 + 16$

$18 \frac{g}{mol}$

Now, Mass of water will be

$\frac{18}{ {6.022 \times 10}^{23} }$

$2.98 \times {10}^{ - 23} g$

This is the required mass of one molecule of water.

5. Hence, it is shown that mass of water is expressed in grams. Hence, the correct choice of the asked question is Option A.

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