CHEMISTRY HIGH SCHOOL

Need help with this equation! Can anybody lay out an answer please?Use this equation; 4Fe + 3O2 -> 2Fe2O3.
If 96.0 grams of oxygen react, what mass of iron was oxidized?

A.) 32.0 g
B.) 96.0 g
C.) 167 g
D.) 223 g

Thanks!

Answers

Answer 1
Answer: As you can see in the reaction, for each 3O_2 that reacts, two Fe_2O_3 are created.

There are (96.0)/(16)=6mol of oxygens reacting, hence 2*6/3=4 mols of iron will be oxidized, which represents 24*55.8=\boxed{223g}

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What is the purpose of the written conclusion in an experiment?

Answers

Answer:

Explanation:

The conclusion is the summary of the post experimental analysis. This involves the comparison of the results of the experiment with the theory and associated background literature related to the research or experimentation topic.

The purpose of the conclusion is to make a brief account of the findings of the research or experimentation process.

it answers the original question that led to the hypothesis

How many moles of water (H2O) would be produced if 10 moles of O2 gas reacted completely with excess H2 gas?2 H2(g) + O2(g) → 2 H2O(g)

A. 5
B. 10 
C. 20
D. 30 

Answers

Answer:

C. 20

Explanation:

Use the equation to know that 1 mol of O2 is equal to 2 mol H2O.

Now you will start with the data, this is 10 mol O2 and you obtain:

10 mol O2  x 2 mol H2O    =  20 mol H2O

                        1 mol O2
2 H2(g) + O2(g) → 2 H2O(g)

according to the reaction:
1 mole of O2-----------------2 moles of H2O
10 moles of O2--------------------- x
x = 20 mole of H2O

answer: C

Is crumpling a sheet of paper a physical or chemical change? Why?

Answers

I believe it is a physical change. Crumpling a sheet of paper does not change any properties of the paper and it does not form a new substance it must be a physical change. It is only the shape or form of the paper that is being changed. Hope this answers the question.
It's a physical change. You're not changing the chemical make up of the piece of paper. Only the appearance. 

Which statement must be true for any chemical reaction at equilibrium?(1) The concentration of the products is greater than the concentration of the reactants.
(2) The concentration of the products is less than the concentration of the reactants.
(3) The concentration of the products and the concentration of the reactants are equal.
(4) The concentration of the products and the concentration of the reactants are constant.

Answers

The correct answer is 3. The concentration of the product and the concentration of the reactants are equal. That is because matter cannot be created or destroyed and the product cannot randomly become something else in the reaction, nor can a reactant change into something different. Simply put, you cannot turn things like water into gold because there will always be an equilibrium.

Answer:

Answer is 4 The concentration of the products and the concentration of the reactants are constant.

Explanation:

In the reaction Mg (s) + 2HCl (aq) H2 (g) + MgCl2 (aq), how many grams of hydrogen gas will be produced from 125.0 milliliters of a 6.0 M HCl in an excess of Mg

Answers

Since the Mg is in excess, therefore HCl will be fully consumed in the reaction.

The first step is to find the amount of HCl in mol

Let  N (HCl) = amount of HCl in mol

 

N (HCl) = (6 mol HCL/L solution) *( 125 mL ) * (1 L/1000 mL) = 0.75 mol of HCl

 

Through stoichiometry

N (H2) = 0.75 mol HCl * (1 mol H2/ 2 mol of HCl)

N(H2) = 0.375 mol H2

 Since we are asked for the number of grams of H2 (mass), we multiply this with the molar mass of hydrogen

 

M (H2) = 0.375 mol H2 ( 2 g H2 / 1 mol H2)

M (H2) = 0.75 g H2 

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Answers

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