Chemistry, 21.07.2019 21:50 harleymichaelbp74jsq

What is the percent yield of hbr if 85.00 g of hbr was formed from 30. g of h2?

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Answer from: vzimokha

1) Chemical equation

H2 (g) + Br2 (g) ---> 2 HBr

2) molar ratios

1 mol H2 : 1 mol Br2 : 2 moles HBr

3) convert 30.0 g of H2 to number of moles

moles = mass in grams / molar mass = 30.0 g / 2.02 g/mol = 14.85 moles

4) calculate theoretical yield

2 moles HBr / 1 mol H2 = x / 14.85 moles H2

=> x = 14.85 moles H2 * 2 moles HBr / 1 mol H2 = 29.7 moles HBr

5) convert 59.52 moles HBr to mass

mass = number of moles * molar mass = 29.7 moles * 80.91 g /mol = 2403.03 g

6) percent yield = (actual yield / theoretical yield) * 100 = (85.00g / 2403.03g)*100 = 3.54%

3.54%

Answer from: Marissa101

Ok, lets see the definitions of percent yield, actual yield and theoretical yield.

Percent yield is the ratio of actual yield to theoretical yield.

Actual yield- amount of product produced in the EXPERIMENT.

Theoretical yield- max amount of product produced through CALCULATIONS

% yield= actual yield (from experiment)/theoretical yield (from calculation) *100

1st Step: Write the reaction

H2 + Br2 --> 2 HBr

2nd Step: Get the mass ratio of H2 and HBr to find theoretical yield

1 mole H2 gives 2 moles HBr ( molar mass of H2= 2 g/mol, HBr= 81 g/mol)

2 g H2 gives 2*81= 162 g HBr

30 g H2 gives 162*30/2 = 2430 g HBr ( The equation is 2 g H2/ 30 gH2= 162 g HBr/ x g HBr)

So theoretically 2430 g HBr are produced by calculation ( THEORETICAL YIELD)

By experiment 85 g HBr are produced as it is given at the question ( ACTUAL YIELD)

% yield= actual yield / theoretical yield *100 = 85/2430 *100= 3.5 %

The percent yield is 3.5 %.

Answer from: Quest

The answer is letter c

Answer from: Quest

hurricanes form when warm, moist air from the ocean surface quickly rises into the atmosphere and forms storm clouds and rain. when the clouds are formed, heat is released which warms the cool air in the upper regions of the atmosphere so that the cycle can continue. which two phases of the water cycle are repeated in this process?

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