Iron(III) oxide + carbon yields carbon monoxide and iron (write the correct formulas and then balance)

Answers

Answer 1

Answer: Iron(III) oxide = Fe₂O₃
Carbon = C
Carbon monoxide = CO
Iron = Fe

Fe₂O₃ + C ⇒ CO + Fe

These are the correct formulas, but the equation is not balanced. There are two Fe's on the left side, so we have to put a 2 in front of the Fe on the right. Also, there are 3 O's on the left but only 1 on the right, so we need to put a 3 in front of the CO; however, this 3 makes it 3 C's on the right, so we balance that off by putting a 3 in front of the C on the left:

Fe₂O₃ + 3C ⇒ 3CO + 2Fe

Answer 2

Answer: Fe(coeffecient 2)O(coeffecient 3) +3C=3CO+2Fe is the balanced equation

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What is the percent composition by mass of nitrogen in NH4NO3 (gram-formula mass = 80.0 grams/mole)?(1) 17.5% (3) 52.5%
(2) 35.0% (4) 60.0%

Answers

Answer:

The correct option is (2) 35.0%

Explanation:

If we want to calculate the percent composition by mass of nitrogen in NH4NO3 we first need to calculate the mass of nitrogen in one mole of NH4NO3.

Because of the molecular form of NH4NO3 (it has 2 ''N'') we know that one mole of NH4NO3 contains 2 moles of N.

The molar mass of N (nitrogen) is $14.0067(g)/(mole)$

This means that 1 mole of N contains 14.0067 grams of N.

Because we have 2 moles of N ⇒ $(2moles).(14.0067(g)/(mole))=28.0134g$

We know that in 1 mole of NH4NO3 we have 2 moles of N(28.0134 g of N).

To calculate the percent composition by mass of nitrogen we need to divide the mass of nitrogen in one mole of NH4NO3 by the mass of one mole of NH4NO3 and then multiply it by 100.

We know that in 1 mole of NH4NO3 there are 80.0 g of NH4NO3 (Because of the molar mass data) ⇒

$((28.0134g)/(80.0g)).100=35.016$ % ≅ 35.0%

We find that the percent composition by mass of nitrogen in NH4NO3 is 35.0%

We conclude that the correct option is (2) 35.0%

gram-formula=80.0grams/mole will be 35.0%

Which fraction of a Sr-20 sample remains unchanged after 87.3 years?

Answers

First off there are some issues in your questions but I can still help in answering this type of problem. First, there is no Sr-20. The 4 abundant form includes Sr-84, Sr-88, Sr-87, Sr-86, Sr-84.
More importantly, the half life of strontium must be given.

For demonstration sake, let us assume Sr-85 is the isotope. It has a half-life of 64.853 days and I'm assuming the units of 87.3 is in days.

A/Ao = e^-(ln2/t)T

where A- final amount Ao -initial amount t- halflife T-total time elapsed

% = e^-(ln2/64.853)(87.3) = 0.3933 or 39.33%

Then there will be an increase in the demand for most goods.If there is an increase in
А consumer price
B. production cost
C. quantity supply
D. consumer income
Please select the best answer from the choices provided
OA
OB
С
&
D

Answers

Answer:

d)consumer income

Explanation:

Answer:

D. consumer income

Explanation:

Edge 2020

Table sugar is not a mineral because?

Answers

it is not a mineral because sugar crystals do not occur naturally its formed from plants such as sugar cane and beets.

A beaker contains three solids: flour, sugar, and baking soda. Whichdescribes the contents of the beaker? *

Answers

Answer: It is a Heterogeneous mixture.

Final answer:

The beaker contains a mixture of three solids, namely flour, sugar, and baking soda. These components retain their properties in the mixture and are not chemically combined.

Explanation:

The contents of the beaker can be described as a mixture. A mixture is a combination of two or more substances that are not chemically combined. In this case, the beaker contains flour, sugar, and baking soda. These are solid substances that maintain their own properties in the mixture. They're simply combined in the same space (the beaker), but they are not interacting on a molecular level to form a new substance.

Learn more about mixtures here:

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Of the choices below, which is true for the relationship shown? a. It is Ka for the acid H3P2O72−. b. It is Kb for the acid H3P2O72−. c. It is Ka for the acid H2P2O72−. d. It is Kb for the acid H2P2O7

Answers

The expression for the Ka for the given acid is:

Ka = [H2P2O7^2-] [H3O+] /[H3P2O7^2-]

Ka is the acid dissociation constant or the acidity constant. It is a measure of the acid strength when in solution. It is an equilibrium constant for the dissociation of the acid.

Answer:

It is Ka for the acid H3P2O72−.

Explanation:

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