Question

9. Calculate the molar mass of each substance. Identify each substance as ammonia

Answer 1

Explanation:

Molecular mass:

Atomic masses:

N = 14g/mol   H = 1g/mol  S = 32g/mol   O = 16g/mol   Cl = 35.5g/mol  

C = 12g/mol  

NH₃ = 14 + 3(1) = 17g/mol

SO₂  = 32 + 2(16) = 64g/mol

Cl₂ = 2(35.5) = 71g/mol

N₂ = 14(2) = 28g/mol

CH₄ = 12 + (4 x 1) = 16g/mol

To solve this problem;

we need to derive an equation to find the molecular mass from the given densities on the table.

At STP;

    Number of moles = $\frac{volume of gas}{y22.4}$        eqn (i)

    Also;

     Number of moles = $\frac{mass}{molar mass}$              eqn (ii)

Now we can equate the two equations;

$\frac{volume of gas}{y22.4}$  =   $\frac{mass}{molar mass}$

  since density is known, we have to rewrite the relationship by making molar mass the subject of the expression:

          Molar mass = $\frac{mass x 22.4}{volume of gas}$

      we know that;

               Density = $\frac{mass }{volume }$

  Molar mass = density x 22.4

Now ;

Molar mass for 1.25g/L  = 1.25 x 22.4 = 28g/mol; which is for N₂

Molar mass for 2.86g/L = 2.86 x 22.4 = 64.1g/mol; which is for SO₂

Molar mass for 0.714g/L = 0.714 x 22.4 = 16g/mol; which is for CH₄

learn more:

Gases at STP brainly.com/question/7795301

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