Question

If the reaction begins with 12.0 grams of O2 how many grams of NO2 will be produced given the following equation: 2 NO + O2 --> 2 NO2​

Answer 1

69g

Step-by-step explanation:

Given reaction expression:

2NO + O₂ →2 NO₂

Unknown:

Mass of NO₂ produced = ?

Solution:

To solve this problem, let us use the mole concept. We solve from the known to the unknown

In this regard, find the number of moles of O₂ given;

Number of moles =
`(mass)/(molar mass)`

Molar mass of O₂ = 2(16g/mol) = 32g/mol

Number of moles =
`(12)/(16)` = 0.75mole

From the balanced reaction equation;

1 mole of O₂ will produce 2mole of NO₂;

0.75 mole of O₂ will produce 1.5mole of NO₂

Therefore, mass of NO₂;

Mass of NO₂ = number of moles x molar mass

Molar mass of NO₂ = 14 + 2(16) = 46g/mol

Molar mass of NO₂ = 1.5 x 46 = 69g