Question

If specific heat of a metal is 0.9 cal/g, then its atomic mass will be approximately equal to
1) 7g
2) 5g
3) 4g
4) 6g

Answer 1

Hello Dear.

Here is the answer---

Given ⇒
Specific Heat of the Metal = 0.9 Cal/g.

Using the Formula,
   Specific Heat × Approximate Atomic Weight = 6.4
⇒ 0.9 × Apr. At. Weight = 6.4
⇒ Apr. At. Weight = 6.4/0.9 
     = 7.1 grams.
     ≈ 7 grams.

Thus, Approximate Atomic Weight of the Metal is 7 grams.
 
Hence, Option 1). is correct.



Hope it helps.

Answer 2

As you know, relation between specific heat and atomic mass
e.g., specific heat × atomic mass = 6.4

Given, specific heat of metal = 0.9 Cal/g
so, atomic mass = 6.4/specific heat
= 6.4/0.9 g
= 64/9 = 7.111 ≈ 7 g

Hence , atomic mass of metal is 7g
So, tbe correct option is (1)