Question

THE SPECIFIC HEAT OF A METAL IS 0.836j/g.THE APPROX at.wt is?

Answer 1

acc to dulong and petit's law:-
specific heat multiplied by at. wt = 6.4
so,
0.836*at wt= 6.4
at.wt=6.4 / 0.836, which is equal to 7.7j/g
the element must be lithium

Answer 2

Answer: The atomic weight of the metal is 7.65 g

Explanation:

Dulong and Petit's law states that the product of the specific heat capacity of a solid element and its mass per mole is always constant which is 6.4

Mathematically,

$\text{Atomic weight}\times \text{Specific heat}=6.4$

We are given:

Specific heat of the metal = 0.836 J/g

Putting values in above equation, we get:

$\text{Atomic weight}=\frac{6.4}{0.836}=7.65$

Hence, the atomic weight of the metal is 7.65 g