Question

7.
19/ms
of the following substance, the greatest
density is that of
(A) 1000 g of water at 4°C
(B) 100.0 cm of chloroform weighing
198.9 g
(C) 10.0 cm piece of wood weighing 7.72
(D) an ethyl alcohol-water mixture of
density 0.83 g cm​

Answer 1

Answer:

B) Chloroform

Explanation:

Density of water at 4°C is 1g/cm³

Density of given chloroform is 198.9/100 = 1.989g/cm³

Density of given piece of wood is 7.72/10 = 0.772g/cm³

Density of given ethyl alcohol-water mixture is 0.83g/cm³

So the highest density is that of Chloroform. So answer is B.

Hope it is helpful.

Answer 2

Answer:

Among all the given substances, the 1000g of water at  4°C has greatest density.

Therefore the option (A) is correct.

Explanation:

• Density of water varies with temperature. The maximum density of mater will be at 4°C. Density of water at 4°C is equal to 1gcm⁻³.
• Given, mass of chloroform, $m=198.9g$

        Volume of chloroform, $V=(100cm)^{3}=10^{6}cm^{3}$

        Density of chloroform  $d=\frac{m}{V}=\frac{198.9g}{10^{6}cm^{3}}$

                                                    $d= 1.989*10^{-4}gcm^{-3}$

• Given, weight of wood $m=7.72g$

         Volume of wood $V=10^{3}cm^{3}$

         Density of wood, $d=\frac{m}{V}=\frac{7.72}{10^{3}} =77.2*10^{-4}gcm^{-3$

• Density of ethyl alcohol-water mixture, $d=0.83gcm^{-3}$.

Therefore, the 1000g of water at  4°C has maximum density among all the given cases.