A1960 silver quarter is found to have a mass of 6.25 grams. on a given day, the value of silver is $17.32 per ounce. how much is this coin worth if the coin is 92% silver?

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.

the answer to your question is c.

if you read the house of usher you should know that the house was haunted

- lead + phosphoric acid = hydrogen + lead(ii) phosphate