What term expresses the ratio of moles of reactants and products according to th

Question

What term expresses the ratio of moles of reactants and products according to the coefficients in the balanced chemical equation? Select one yield ratio product ratio reactant ratio product ratio none of the above How many bromine molecules. Br_2f have a mass equal to 21.8 g? Select one: 2.40 times 10^23 molecules 1.91 times 10^25 molecules none of above 1.20 times 10^23 molecules 0 82 times 10^23 molecules What is the molar mass of trinitrotoluene (TNT). C_7H_5(NO_2)_3? Select one: 135.13 g/mol none of above 127.15 g/mol 405.39 g/mol 63.07 g/mol How many moles of carbon monoxide react with 1.5 mole of oxygen gas according to the balanced chemical equation? 2 CO + O2(g) = 2 CO_2 Select one: 1 mol 2 mol 3 mol 4 mol none of the above

Explanation / Answer

1. None of the above

The right answer is Mole Ratio.

.

2. molar mass of Br2 = 159.808 g/mol

or, mass of 6.023*1023 Br2 molecules = 159.808 g/mol

So,

number of Br2 molecules having mass of 21.8 g

= (6.023*1023 molecules.mol-1)(21.8 g) / (159.808 g.mol-1)

= 0.82 * 1023 molecules

.

3. Molar mass of C7H5(NO2)3

= (7*12 + 5*1 + 14*3 + 16*6 )g.mol-1

= 227 g/mol

Answer: none of above

.

4. 2 moles of CO reacts with 1 mol of O2, so 1.5 mole of oxygen will react with (2*1.5) or 3 mole of CO.

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