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vredina [299]
3 years ago
8

Will mark as Brainliest.

Chemistry
2 answers:
LUCKY_DIMON [66]3 years ago
8 0
Gas i took the test plz mark brainliest!
Georgia [21]3 years ago
4 0
The ans is B gas.
hope this helps!!
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State how many mole ratios can be written for a reaction involving three substances.
Harrizon [31]
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6 0
3 years ago
If an atom of Phosphorous has 17 neutrons, what is its mass number?
Alina [70]
Mass number = number of protons + number of neutrons

The number of protons in the nucleus of an atom of phosphorus is equal to the atomic number of phosphorus, which is 15. If an atom of phosphorus has 17 neutrons, then the mass number would be 15 protons + 17 neutrons = 32. Thus, the correct answer choice here is B.
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2 years ago
A laboratory analysis of an unknown sample yields 40.5% carbon, 4.5% hydrogen, and 55.0% oxygen. if the sample has a molar mass
den301095 [7]
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n(C) = 3,375 mol.
n(H) = m(H) ÷ M(H).
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n(O) = m(O) ÷ M(O).
n(O) = 55 g ÷ 16 g/mol.
n(O) = 3,4 mol.
n(C) : n(H) : n(O) = 3,375 mol : 4,5 mol : 3,4 mol / :3,375.
n(C) : n(H) : n(O) = 1 : 1,33 : 1.
n(C) : n(H) : n(O) = 3 : 4 : 3.
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6 0
2 years ago
How many molecules are there in 2.30 grams of NH3
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<span>Avogadro's number represents the number of units in one mole of any substance. This has the value of 6.022 x 10^23 units / mole. This number can be used to convert the number of atoms or molecules into number of moles. We calculate as follows:

2.30 g NH3 (1 mol / 17.03 g ) (</span>6.022 x 10^23 molecules / 1 mol ) = 8.13x10^22 molecules
7 0
3 years ago
Explain radiation zone and convection zone.
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