Question

how much of oxygen reacts with 240 grams of magnesium? atomic mass of magnesium is 24U you and oxygen is 16U

Answer 1

Answer:

2Mg+O

2

→2MgO

1 mole of O

2

is required for 2 Moles of Mg

5 Moles of O

2

is required for 10 Moles of Mg

So , 32×5g of O

2

is required = 160 g

160 g of O

2

is required to combust 10 Moles of Mg

Answer 2

Given:

The mass of Magnesium = 240 gm

The atomic mass of mg = 24 gm

The atomic mass of oxygen = 16 gm

To Find:

Mass of oxygen that reacts with 240 gm Magnesium.

Calculation:

The reaction of Magnesium with oxygen can be depicted as:

Mg + 1/2 O2 → MgO

⇒ The mass of oxygen that reacts with 24 gm Magnesium = 16 gm

⇒ The mass of oxygen that reacts with 240 gm Magnesium = (16/24) × 240

⇒ Mass of oxygen = 160 gm

- Hence, 160 gm of oxygen is required to react completely with 240 gm Magnesium.