Asilver-copper alloy had a mass of 0.1264g. when the alloy was dissolved in nitric acid and the silver precipitated as silver chloride, the precipitate had a mass of 0.1375g. calculate the percent of silver in the alloy. for full credit, make sure you show your calculations.

The percent of silver in the alloy is 81.87%.

Explanation:

Mass of the alloy = 0.1264 g

Mass of silver chloride precipitate = 0.1375 g

Moles of silver chloride precipitate =

In 1 mole of silver chloride there are 1 mole of silver, then in 0.0009582 moles of silver chloride will ahve:

of silver

Mass of 0.0009582 moles of silver = 0.0009582 × 108 g/mol=0.1035 g

The percent of silver in the alloy:

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.

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