An unknown compound has the following chemical formula: where stands for a whole number. Measurements also show that a certain sample of the unknown compound contains of nitrogen and of oxygen. Write the complete chemical formula for the unknown compound.

The question is incomplete, the complete question is;

An unknown compound has the following chemical formula:  

N2Ox  

where x stands for a whole number.  

Measurements also show that a certain sample of the unknown compound contains 3.7 mol of oxygen and 2.45 mol of nitrogen.  

Write the complete chemical formula for the unknown compound.

The complete formula of the compound is N2O3.

Explanation:

Given;

Number of moles of N = 2.45 moles

Number of moles of O = 3.7 moles

Chemical formula of unknown compound = N2Ox

From the ratio of the number of moles of N to O;

2/x = 2.45/3.7

2 * 3.7 = x * 2.45

x = 2 * 3.7/ 2.45

x =3

Hence the complete formula of the compound is N2O3.

put the answers   and i could answer.

the density of gold = 19.3 g/cm3

the relation between density and mass and volume is

density = mass / volume

given :

mass of gold = 13 g

density = 13g / volume = 19.3

volume = 13 /19.3 = 0.67 cm^3

thus volume of gold nugget = 0.67 cm^3