A0.4230 g sample of impure sodium nitrate (contains sodium nitrate plus inert ingredients) was heated, converting all the sodium nitrate to 0.2820 g of sodium nitrite and oxygen gas. determine the percent of sodium nitrate in the original sample.

Percent of sodium nitrate is 82.13%

Explanation:

Number of moles of a compound is the ratio of mass of the compound to molar mass of the compound.

Molar mass of = 68.9953 g/mol

Molar mass of = 84.9947 g/mol

So, 0.2820 g = moles of    = 0.004087 moles of  

Above equation suggests, 1 mol of    is formed from 1 mol of  

So, 0.004087 moles of   are formed from 0.004087 moles of  

So, mass of 0.004087 moles of   =

% of  in sample = % = %

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.