Question

1. You are analyzing 2.880 g of an unknown compound. You have previously confirmed that this compound hasthe following composition: 66.05 % carbon, 23.18 % oxygen, 6.72 % hydrogen, and 4.05 % nitrogen. If thiscompound decomposes into its constituent elements, determine the mass of each element recovered afterdecomposition. 3 pts

Answer 1

Assuming, as usual, that the composition of the unknown compound is given in mass percentages, since we know that we have 2.880 g of this compound, we can apply each percentage to get the mass we will get of each element.

For carbon, we have 66.05%, so:

`m_C=0.6605\cdot2.880g=1.90224g\approx1.902g`

For oxygen, we have 23.18%, so:

`m_O=0.2318\cdot2.880g=0.667584g\approx0.6676g`

For hydrogen, we have 6.72%, so:

`m_H=0.0672\cdot2.880g=0.193536g\approx0.1935g`

For nitrogen, we have 4.05%, so:

`m_N=0.0405\cdot2.880g=0.11664g\approx0.1166g`