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miskamm [114]
2 years ago
8

I have no clue what to do, HELP!!

Chemistry
1 answer:
Mashcka [7]2 years ago
3 0
The molar ratios in the reaction are 1:1::1:2, so one Mole (Na2CrO4, produces two moles, (NaNO3).

Using the equation: moles = mass(g) /Mr
1. Calculate the Mr of Na2CrO4
from the periodic table,
Na x 2 = 23 x 2 = 46
Cr x 1 = 52 x 1 = 52
O x 4 = 16 x 4 = 64
46 + 52 + 64 = 162.
moles (na2CrO4) = 253 g / 162 = 1.56 moles.
moles(NaNO3) = 1.56 x 2 = 3.12 moles.

The answer is 3.12 moles.

Hope this helps!
Correct me if I'm wrong.
(Some of this was due to help from Yahoo!)
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Oxygen is an example of a(n)
stepladder [879]

Answer:

C. element. oxygen is an element

Explanation:

oxygen is element #8

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3 years ago
In sediments and waterlogged soil, dissolved O2 concentrations are so low that the microorganisms living there must rely on othe
kakasveta [241]

Answer:

1) SO₄ ²⁻ : (+6)

  H₂S : (-2)

Explanation:

a) <u>Sulfate reducers</u> are widespread in muds and other sediments, water-logged soils, etc., environments that contain SO₄ ²⁻ and become anoxic as a result of microbial decomposition.

Sulfate (SO₄ ²⁻), the most oxidized form of sulfur (+6), <u>is reduced</u> by these

sulfate-reducing bacteria. The end product of sulfate reduction is hydrogen sulfide, H₂S, (oxidation number -2) an important natural product that participates in many biogeochemical processes. The H₂S they generate is responsible for the pungent smell (like that of rotten eggs) often encountered near coastal ecosystems. When sulfate-reducing bacteria grow, the H₂S formed from SO₄ ²⁻ reduction combines with the ferrous iron to form black, insoluble ferrous sulfide, which is not toxic. This is important for the conservation of the environment.

b) The net ionic equation under acidic conditions is:

              4 H₂ + SO₄²⁻ + H⁺ → HS⁻ + 4 H₂O

    Global reaction:  SO₄²⁻ + 2H⁺ → H₂S + O₂

3 0
2 years ago
Plz help me plz I am timed!!
PolarNik [594]

Answer:

full moon

Explanation:

....ur welcome..............

6 0
2 years ago
Read 2 more answers
Which of these have the same number of particles as 1 mole of water H2O
Fed [463]

Answer:

It is equal to Avogadro's number (NA), namely 6.022 x1023. If we have one mole of water, then we know that it will have a mass of 2 grams (for 2 moles of H atoms) + 16 grams (for one mole O atom) = 18 grams.

Explanation:

The question is not very much clear.

If you are asking for molecules then 1 mole water= 6.023 * 10^23

If you are asking for atoms then 1 mole water= 6.023 * 10^23 * 3

If you are asking for particles then,

So, in your example you would have one mole of water molecules. If you dissociated those water molecules, than you would end up with 2 moles of hydrogen atoms, and one mole of oxygen atoms.

I hope that was helpful!

H=1 proton,1 electron

O=8 protons,8 neutrons and 8 electrons

total particles in one H2O molecule-28

total no. of particles in 1 mole of water- 6.023 * 10^23 * 28

8 0
2 years ago
A chemistry student was asked to calculate the number of moles of iron required to react with 1.20 mol of oxygen to produce iron
Delicious77 [7]

Answer:Write and balance the equation

4Fe + 3O2 -> 2Fe2O3

0.32 mol Fe x 2 mol Fe2O3 / 4 mol Fe =

0.16 mol of Fe2O3

Explanation:

8 0
2 years ago
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