Which of the following statements is true about emission spectra? a. emission spectra form dark lines on a continuous spectrum. b. the wavelengths of the spectrum are characteristic of the element emitting the light. c. the wavelengths of the spectrum are the same for all atomic gases. d. the wavelengths of the spectrum are the same for all elements.

b. The wavelengths of the spectrum are characteristic of the element emitting the light.

Explanation:

Emission spectra occur when an electron jumps from a higher energy level to a lower energy level. Each atom of an element has a unique distribution of the number of electrons in different energy levels. Therefore each element has characteristic emission spectra. Emission spectra are seen as bright lines.

n+h→nh3

we must remember that nitrogen and hydrogen are both diatomic molecules in their standard gas form. this adjusts the equation to

n2+h2→nh3

now we need to adjust coefficients in order to balance the atoms on each side of the equation. currently we have 2 atoms of nitrogen and 2 atoms of hydrogen on the reactant side and 1 atom of nitrogen and 3 atoms of hydrogen on the product side.

we can balance the hydrogens by placing a coefficient of 2 in front of ammonia and a coefficient of 3 in front of the hydrogen.

n2+3h2→2nh3

this gives us 6 hydrogen on each side and coincidentally the nitrogens now equal 2 on each side.