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swat32
3 years ago
15

How many grams of CO are needed with an excess of Fe2O3 to produce 35.0 g Fe? Please show work.

Chemistry
1 answer:
Dominik [7]3 years ago
3 0
We must first write out the entire equation for this reaction which is as follows:

CO + Fe2O3 --> Fe + CO2

Now we must balance this equation which provides us with the following equation:

3 CO + Fe2O3 --> 2Fe + 3 CO2

We are told that we have excess Fe2O3, so that suggests that CO is the limiting reagent. We now simply convert the mass of Fe given to moles of Fe, and convert moles of Fe to moles of CO.

35.0 g Fe/ 55.845 g/mol = 0.627 moles Fe

0.627 moles Fe x (3 moles CO)/(2 moles Fe) = 0.940 moles CO

Now with the moles of CO present, we simply convert this back to mass using the molecular weight of CO.

0.940 moles CO x 28.01 g/mol = 26.3 g CO.

Therefore, 26.3 g of CO are needed to produce 35.0 g of Fe. Since we began with three significant figures in our starting mass, our answer must also have three significant figures.
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Answer: The reaction is exothermic

The \Delta H value is negative.

Heat is a product.

Explanation:

2H_2(g)+O_2(g)\rightarrow 2H_2O(l)+136.6kcal

Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and \Delta H for the reaction comes out to be positive.

Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and \Delta H for the reaction comes out to be negative.

The substances which are written on the left side of the arrow are reactants and the substances which are written on the right side of the arrow are products. Thus heat is a product.

5 0
4 years ago
What is the mass of a liquid that has a volume of 50.0ml and a density of 2.40g/ml?
Iteru [2.4K]

Answer:

120g Using Density Equation.

Explanation:

Density =mass/volume

We need to the solve for the mass.

Mass=Density * Volume

Mass= 2.40 g/ml * 50.0 ml = 120g

5 0
4 years ago
From this list, select the element that forms π bonds most readily. from this list, select the element that forms bonds most rea
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Nonmetals which are located in the second row form pi bonds more easily than the elements situated in the third row and below. Actually there are no compounds or molecules known that forms covalent bonds to the noble gas Ne and Ar. Hence the other second row element which is Carbon, is the element that forms pi bonds most readily.

 

Answer:

<span>C</span>

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3 years ago
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aksik [14]

Answer:

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hope it helps

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Explanation:

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