During heating a 5 g solid gives off oxygen gas. The mass of the residue after heating is 3.5 g. What is the mass of the oxygeb ? What percent of the compoiund is oxygen?
A ==> C
A start is 5.0 g
A finish is 3.5
mass oxygen must be 5.0-3.5 = ??
%oxygen = (mass oxygen/mass compound)*100 =??
1.5g
To find the mass of oxygen gas given off during heating, we need to calculate the difference in mass between the initial mass of the solid and the mass of the residue after heating.
Given:
Initial mass of the solid = 5 g
Mass of the residue after heating = 3.5 g
Mass of oxygen gas = Initial mass of the solid - Mass of the residue after heating
= 5 g - 3.5 g
= 1.5 g
Therefore, the mass of the oxygen gas given off during heating is 1.5 g.
To find the percent of the compound that is oxygen, we need to calculate the percentage of the mass of oxygen gas in relation to the initial mass of the solid.
Percent of oxygen = (Mass of oxygen gas / Initial mass of the solid) * 100
= (1.5 g / 5 g) * 100
= 30%
Therefore, the compound is 30% oxygen.