Question

I WILL GIVE BRAINLIEST. When a mole of lithium reacts chemically with hydrogen to form lithium hydride, the energy released is found to be roughly 90 joules. How much mass is lost?
1.0 x 10-15 kg
2.7 x 1010 kg
1.0 x 1015 kg
3.0 x 10-7 kg

Answer 1

the answer is 3.0 * 10^-7

Answer 2

Answer : The mass lost is, $1.0\times 10^{-15}Kg$

Explanation :

According to the Einstein equation, the energy is equal to the product of mass and the square of the speed of light.

The mathematical expression is :

$E=m\times c^2$

where,

E = energy  = 90 J = $90Kg.m^2/s^2$

c = speed of light = $3\times 10^8m/s$

m = mass = ?

Now put all the given values in the above formula, we get the amount of energy released.

$90Kg.m^2/s^2=m\times (3\times 10^8m/s)^2$

$m=1.0\times 10^{-15}Kg$

Therefore, the mass lost is, $1.0\times 10^{-15}Kg$