Question

which statement is true about this reaction?
( ce{_{7}^{14}n + _{1}^{1}h -> _{8}^{15}o} )

○ it is a practical source of energy on earth.
○ it occurs only outside the solar system.
○ its product is heavier than each of its reactants.
○ it shows the critical mass of an element.

Explanation:

1. Analyze the first option: Reactions like this (nuclear fusion - like, but here it's a nuclear reaction) are not practical energy sources on Earth currently (fusion for energy is still in development, and this specific reaction isn't a practical energy source). So this is false.
2. Analyze the second option: Nuclear reactions like this can occur in the solar system (e.g., in stars, but also some on Earth in labs). So saying it occurs only outside the solar system is false.
3. Analyze the third option: Calculate the mass numbers. Reactant mass numbers: \(^{14}\text{N}\) has mass number 14, \(^1\text{H}\) has mass number 1. Product \(^{15}\text{O}\) has mass number 15. 15 is greater than 14 and 1, so the product's mass (related to mass number here, assuming atomic mass follows mass number trend) is heavier than each reactant. This is true.
4. Analyze the fourth option: Critical mass is related to nuclear fission (sustaining a chain reaction), not this type of nuclear reaction (fusion - like or transmutation). So this is false.

Answer:

Its product is heavier than each of its reactants.