Question

How many moles of oxygen are required to make 4 moles of water?​

Answer 1

Answer:

2 moles of oxygen

Explanation:

Basic Equation (given) :

2H₂ (g) + O₂ ⇒ 2H₂O (g)

• From this, we understand for every 2 moles of water, 1 mole of oxygen is needed

Taking the number of moles of oxygen and water in proportion :

• 1 : 2
• 1 × 2 : 2 × 2
• 2 : 4

Therefore, 2 moles of oxygen are required to make 4 moles of water.

Answer 2

$\textsf{\qquad\qquad\huge\underline{{\sf Answer}}}$

As per the given equation, we can infer that :

For getting 2 moles mole of water, 1 mole of oxygen gas was required. so to get 4 moles of water we need :

We just have to multiply the whole reaction by 2 on both sides, in order to get 4 moles of H2O on product side.

$\qquad \qquad \rm4 \: H_2 + 2 \: O_2 \rightarrow4 \: H_2O$

therefore, we need

$\qquad \sf  \dashrightarrow \: 2 \times 1 = 2 \: moles \: \: oxygen \: gas$