Percentage Composition

Find the total percentage of oxygen in magnesium nitrate crystals.

$\mathrm{Mg}{\left({\mathrm{NO}}_3\right)}_2.6{\mathrm{H}}_2\mathrm{O}\left(\mathrm{H}=1 \mathrm{u}, \mathrm{N}=14 \mathrm{u}, \mathrm{O}=16 \mathrm{u}, \mathrm{Mg}=24 \mathrm{u}\right)$

Some of the fertilizers are sodium nitrate $\left({\mathrm{NaNO}}_3\right)$, ammonium sulphate $\left[({\mathrm{NH}}_4{)}_2{\mathrm{SO}}_4\right]$ and urea $\left[\mathrm{CO}({\mathrm{NH}}_2{)}_2\right]$. Which of these contains the highest percentage of nitrogen?

Calculate the percentage of nitrogen in ammonium nitrate $\left({\mathrm{NH}}_4{\mathrm{NO}}_3\right)$.

Calculate the percentage of nitrogen in following compound.

${\left({\mathrm{NH}}_4\right)}_2{\mathrm{SO}}_4$ atomic mass of atoms $\left(\mathrm{Ca}=40\mathrm{u}, \mathrm{N}=14\mathrm{u}, \mathrm{O}=16\mathrm{u}, \mathrm{C}=12\mathrm{u}, \mathrm{H}=1\mathrm{u}, \mathrm{S}=32\mathrm{u}\right)$

Calculate the percentage of nitrogen in following compound.

${\mathrm{CaCN}}_2$ atomic mass of atoms $\left(\mathrm{Ca}=40\mathrm{u}, \mathrm{N}=14\mathrm{u}, \mathrm{O}=16\mathrm{u}, \mathrm{C}=12\mathrm{u}, \mathrm{H}=1\mathrm{u}, \mathrm{S}=32\mathrm{u}\right)$

Calculate the percentage of nitrogen in following compound.

$\mathrm{Ca}{\left({\mathrm{NO}}_3\right)}_2$ atomic mass of atoms $\left(\mathrm{Ca}=40\mathrm{u}, \mathrm{N}=14\mathrm{u}, \mathrm{O}=16\mathrm{u}, \mathrm{C}=12\mathrm{u}, \mathrm{H}=1\mathrm{u}, \mathrm{S}=32\mathrm{u}\right)$

Calculate the percentage of oxygen in the following:

${\mathrm{Al}}_2{\left({\mathrm{SO}}_4\right)}_3\left(\mathrm{Hg}=200 \mathrm{u}, \mathrm{O}=16 \mathrm{u}, \mathrm{K}=39 \mathrm{u}, \mathrm{Cr}=52 \mathrm{u}, \mathrm{Al}=27 \mathrm{u}, \mathrm{S}=32 \mathrm{u}\right)$.

Calculate the percentage of oxygen in the following :

${\mathrm{K}}_2{\mathrm{Cr}}_2{\mathrm{O}}_7$$\left(\mathrm{Hg}=200 \mathrm{u}, \mathrm{O}=16 \mathrm{u}, \mathrm{K}=39 \mathrm{u}, \mathrm{Cr}=52 \mathrm{u}, \mathrm{Al}=27 \mathrm{u}, \mathrm{S}=32 \mathrm{u}\right)$

Calculate the percentage of oxygen in the following:

$\mathrm{HgO}$$\left(\mathrm{Hg}=200,\mathrm{O}=16,\mathrm{K}=39,\mathrm{Cr}=52,\mathrm{AI}=27,\mathrm{S}=32\right)$