Chemistry, 09.07.2019 17:00 kaneisha20

What is the theoretical yield of chromium that can be produced by the reaction of 40.0 g of cr2o3 with 8.00 g of aluminum according to the chemical equation below? 2al + cr2o3 --> al2o3 + 2cr?

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Answer from: fatlenny

The theoretical yield of chromium will be 15.05 g

Solution:

The balance chemical equation

2Al + Cr2o3 --> Al2o3 + 2Cr

From given mass, we can calculate moles

mass of Al = 8 g mass of Cr2O3 = 40g

Molar mass of Al = 26.98g/mol Molar mass of Cr2O3 = 151.9g/mol

Mole of Al = 8/26.98 Mole of Cr2O3 = 40/151.9

Mole of Al = 0.29 mole Mole of Cr2O3 = 0.26 mol

Here, we have to find out the limiting reactant (The reactant which will give the least amount of product) so from balance chemical equations

No. of mole of Al =No. of moles of Cr

2 = 2

0.29 = 2/2 × 0.29 = 0.29 mole

No. of mole of Cr2O3 =No. of moles of Cr

1 = 2

0.26 = 2/1 × 0.26 = 0.52 mole

So we can say, Al is a limiting reactant so

No. of mole of Al =No. of moles of Cr

2 = 2

0.29 = 2/2 × 0.29 = 0.29 mole

Moles of Cr = 0.29 mol

Molar mass of Cr = 51.9 g/mol

mass of Cr = 0.29 × 51.9 = 15.05 g

Conclusion:

The calculated mass from balance chemical equation of Cr will be 15.05 g.

Answer from: Quest

hloride, what is the mass of calcium in

explanation:

Answer from: Quest

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. $hbr$ completely dissociates to $h^+$ and $br-$ ions. a is incorrect because $h_2s$ does not fully ionize to $h^+$ and $hs^-$ ions and some remain as the compound $h_2s$ . c and d are incorrect because, $li_2o$ and $libr$ do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise, if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both $li_2o$ and $libr$ have a complete octet so can not accept any electrons which disqualifies them as acids.

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What is the theoretical yield of chromium that can be produced by the reaction of 40.0 g of cr2o3 wi...

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