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Vladimir [108]
3 years ago
10

What is the percentage of water in the following compound?

Chemistry
2 answers:
Rainbow [258]3 years ago
7 0

Answer: The mass percent of water in Na_2CO_3.10H_2O is 63%.

Explanation:

In Na_2CO_3.10H_2O, there are 2 sodium atoms, 1 carbon atom 13 oxygen atoms and 20 hydrogen atoms.

To calculate the mass percent of element in a given compound, we use the formula:

\text{Mass percent of water}=\frac{\text{Mass of water}}{\text{Molar mass of}Na_2CO_3.10H_2O}\times 100

Mass of water = 10\times 18g/mol=180g

Mass of Na_2CO_3.10H_2O= 286 g

Putting values in above equation, we get:

\text{Mass percent of water}=\frac{180}{286}\times 100=63\%

Hence, the mass percent of water in Na_2CO_3.10H_2O is 63%

vagabundo [1.1K]3 years ago
5 0
<span>Mass of Na2CO3, then add 10 (molecular mass of water which is 18g)

So we have 106g+180g = 286g if we are looking for the percentage of water in the compound we do this 180g/286g= 62.9

</span><span> SO2 because sulfurs atomic mass is 32g and Oxygen atomic mass is 16g</span>
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Answer:The outer core of the Earth contains a lot of iron in a molten state. As the Earth spins this molten iron moves and creates the Earth's magnetic field. The Earth behaves as if there is a huge bar magnet at its centre. The shape of the field around the Earth is very similar to the field around a bar magnet

Explanation:

6 0
2 years ago
How many milliliters of a 3.0 M HCL solution are required to make 250.0 milliliters of 1.2 M HCL
tiny-mole [99]
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5 0
3 years ago
When heated, lithium reacts with nitrogen to form lithium nitride: 6Li(s) + N2(g) → 2Li3N(s) What is the theoretical yield of Li
anyanavicka [17]

Answer:

The % yield of the reaction = 27.5 %

Explanation:

Step 1: Data given

Mass of Li = 12.7 grams

Mass of N2 = 34.7 grams

Actual yield of Li3N = 5.85 grams

Molar mass of  Lithium = 6.94 g/mol

Molar mass of N2 = 28 g/mol

Molar mass of LI3N = 34.83 g/mol

Step 2: The balanced equation:

6Li(s) + N2(g) → 2Li3N(s)

Step 3: Calculate moles of Lithium

Moles Li = mass Li / Molar mass Li

Moles Li = 12.7 grams / 6.94 g/mol

Moles Li = 1.83 moles

Step 4: Calculate moles of N2

Moles N2 = 34.7 g/ 28 g/mol

Moles N2 = 1.24 moles

Step 5: Limiting reactant

For 6 moles Li consumed, we need 1 mole of N2 to produce 2 moles of Li3N

Lithium is the limiting reactant. It will completely be consumed (1.83 moles).

N2 is in excess. There will be consumed 1.83 / 6 = 0.305 moles

There will remain 1.24 - 0.305 = 0.935 moles

Step 6: Calculate moles of Li3N

For 6 moles Li consumed, we need 1 mole of N2 to produce 2 moles of Li3N

For 1.83 moles Li, we'll have 1.83/3 = 0.61 moles of Li3N

Step 7: Calculate mass of Li3N

Mass Li3N =moles LI3N * Molar Mass LI3N

Mass Li3N = 0.610 moles * 34.83 g/mol

Mass Li3N = 21.2463 grams = Theoretical yield

Step 8: Calculate % yield

% yield = actual yield / theoretical yield

% yield = (5.85 / 21.2463)*100% = 27.5%

The % yield of the reaction = 27.5 %

8 0
3 years ago
Why are human matter?
MAXImum [283]
We have mass. Anything that generally includes atoms is matter
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a) Group 2 elements have 2 electrons on their outer shell, so they form a 2+ charge.

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hope this helps! :)
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2 years ago
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