Question

a reaction of heating potassium permanganate produces potassium manganate, manganese dioxide and oxygen gas. heat 15.8 g potassium permanganate until no more oxygen gas is given off. the remaining material has a mass of 14.2 g. what mass of oxygen gas was produced in the reaction? — g

Explanation:

Step1: Apply mass - conservation principle

The initial mass of potassium permanganate is used to produce oxygen gas and the remaining solid. The mass of oxygen gas can be found by the difference in mass before and after the reaction.
Let the initial mass of potassium permanganate be $m_{initial}=15.8\ g$ and the mass of the remaining material be $m_{remaining} = 14.2\ g$.

Step2: Calculate the mass of oxygen gas

The mass of oxygen gas $m_{O_2}$ is given by the formula $m_{O_2}=m_{initial}-m_{remaining}$.
Substitute the values: $m_{O_2}=15.8 - 14.2$.
$m_{O_2}=1.6\ g$

Answer:

$1.6$