Question

a piece of coal has a mass of 50 gram volume of 20 cm cube. find its density and relative density​

Answer 1

Answer :

We have,

• Mass of coal 50 g
• Volume is 20³ cm

To do,

• Find the density and relative density.

Solution :

We know that,

• Formula for Density

$\large{\boxed{\underline{\sf{Density = \dfrac{Mass}{Volume}}}}}$

As we have,

• Mass and volume from the question. Put it in the formula

= ${\sf{Density = \dfrac{Mass}{Volume}}}$

= ${\sf{Density = \dfrac{50\:g}{20\:{c}^{3}}}}$

= ${\sf{Density = 2.5\:g\;{c}^{3}}}$

Now,

Coming on the second part of question,

• Formula for relative density

$\large{\boxed{\underline{\sf{Relative\;Density= \dfrac{Mass\;of\;Substance}{Mass\;of\;amount\;of\;water}}}}}$

Put values in formula :-

= ${\sf{Relative\;Density= \dfrac{Mass\;of\;Substance}{Mass\;of\;amount\;of\;water}}}$

= ${\sf{Relative\;Density= \dfrac{2.5}{1\:g\;{c}^{3}}}}$

= ${\sf{Relative\;Density= 2.5}}$

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