Answer:
69g
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 = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of O₂ = 2(16g/mol) = 32g/mol
Number of moles = [tex]\frac{12}{16}[/tex] = 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
