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xz_007 [3.2K]
2 years ago
6

A chemist obtains a sample of

Chemistry
1 answer:
djverab [1.8K]2 years ago
7 0

The number of formula units of Na₂SO₄ present in the sample is 3.01×10²³ units

<h3>Avogadro's hypothesis </h3>

From Avogadro's hypothesis,

1 mole of Na₂SO₄ = 6.02×10²³ units

But

1 mole of Na₂SO₄ = (23×2) + 32 + (16×4) = 142 g

Thus,

142 g of Na₂SO₄ = 6.02×10²³ units

<h3>How to determine the units in 71 g of sample </h3>

142 g of Na₂SO₄ = 6.02×10²³ units

Therefore,

71 g of Na₂SO₄ = (71 × 6.02×10²³) / 142

71 g of Na₂SO₄ = 3.01×10²³ units

Thus, 3.01×10²³ units of Na₂SO₄ is present in the sample

Learn more about Avogadro's number:

brainly.com/question/26141731

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Question 10 (1 point)
levacccp [35]
The empirical formula gives the relative ratio of atoms in each element. Therefore, it simplifies the whole numbers. For example C2H6 can be reduced to CH3 because they share the greatest common factor (2). The answer to this question would be #1. C4H10 can be reduced to C2H5 because 4 and 10 are both divisible by 2. C2H5 can not be reduced any further. All of the other options do not have a greatest common factor making them a empirical formula.
4 0
2 years ago
I will give brainliest!!! In the reaction represented by the equation Al2O3 -&gt; Al + O2, what is the mole ratio of aluminum to
Effectus [21]

Answer:;

4:3

Explanation:

Balanced:

4Al + 302 yields 2al2O3

7 0
3 years ago
intrusive igneous rock forms when the cooling of magma takes place fast on the top of the Earth's surface. A. True B. False
-BARSIC- [3]

Answer:

A

Explanation:

True igneous rock forms cooling of magma fast on the top

5 0
2 years ago
Read 2 more answers
2.4 g of a solid is added to 91 g of water. What is the mass % concentration of the solution?
vladimir2022 [97]

Answer:

2.64%

Explanation:

mass percent = (grams of solute / grams of solution) x 100

mass percent = (2.4 / 91) × 100

mass percent = 2.64% to 3sf

8 0
1 year ago
Fe(NO3)2 not sure how to get the oxidation numbers of all elements
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You must remember that oxidation number of hydrogen in acids is always +1, oxidation number of oxygen in oxides & acids is always -2... metals has always oxidation number on plus!

group NO3 comes from HNO3...and oxidation number of whole acid group is always on minus and equal to the amount of hydrogen atoms in this acid... so oxidation number of NO3 = -1

we have 2 NO3 groups so 2*(-1) = -2 and that is the reason why oxidation number of Fe in this formula must be +2... because sum of all elements always gives 0!

Now we could count of oxidation number for nitrogen... we write HNO3 and start counting from right to left:
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so nitrogen must have +5 oxidation number... because sum all in formula must be 0.


4 0
2 years ago
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