Which of the following statements about nuclear reactions is true?

they do not follow einstein's equation since no changes in mass or energy occur.

they follow the law of conservation of energy only.

they follow the law of conservation of mass only.

they follow einstein's equation, which allows for the conversion of mass to energy.

They follow Einstein's equation, which allows for the conversion of mass to energy is true about nuclear reaction.

Explanation:

The nuclear reactions happen according the Einstein’s equation, i.e.,  when the mass deficit between the weight of the nucleus as a whole and the individual constituent components occurs, this deficit is converted to energy that is released and used for nuclear reactions.

No mass can never be made or destroyed. So is energy. Energy too has to remain constant; there can be a change in the form, energy can be converted into mass or vice versa but the constancy has to be maintained.

a. the law of proportion states the combination of 2 atoms in a specific ratio to produce multiple compounds such as the given statement of question ‘1st compound contains 88.8 % cu ’ indicates 88.8 g of cu is present along with 11.2 g oxygen in 100 g of compound whereas the statement ‘2st compound contains 79.9 % cu ’ indicates 79.9 g of cu is present along with 20.1 g oxygen in 100 g of compound

1st compound contains 88.8 g cu

for cu

m = 63 g /mol

atomic % = 88.8 /63 = 1.42

for o

m = 16 g /mol

atomic % = 11.2 /16 = 0.7

b. the emperical formula of 1st compound is

cu1.4o0.7

cu2o