Question

A student electrolysed some water. He collected 20 cm³ of hydrogen. What volume of oxygen could he also have collected at the same time?

Answer 1

Answer:10cm cubed

Explanation:to be honest i dont know but the answer is right, trust me.

Answer 2

He would have collected 10 cm³ of oxygen.

Explanation:

• In the lectrolysis of water, it breaks into oxygen gas and hydrogen gas.
• When we balance the equation by using the law of conservation of mass, we get $2H_{2}O\rightarrow2H_{2}+O_{2}$
• For every 1 mole of oxygen there exist 2 moles of hydrogen, this means that the amount of hydrogen gas liberated will be twice the amout of oxygen gas liberated.
• So, 10 cm³ of oxygen gas will be produced if 20 cm³ was collected.