Question

2.7 gm Al reacts with how many grams of O2?

Answer 1

Answer:

Answer is b)

Explanation:

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Answer 2

Given - Amount of aluminium - 2.7 gram

Find - Amount of oxygen with which given amount of aluminium will react.

Solution - Chemical equation representing the reaction of aluminium and oxygen is -

4Al + 3O2 → 2Al2O3

Here, 4 moles of aluminium react with 3 moles of oxygen.

Number of moles of aluminium present - 2.7/27

Number of moles of aluminium - 0.1

4 moles of aluminium react with 3 moles

0.1 moles of aluminium will react with = 3/4*0.1 = 0.075 moles of oxygen.

Converting moles of oxygen to its amount = 0.075*32 = 2.4 gram.

Hence, option b) 2.4 gram is the correct answer.