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Delvig [45]
3 years ago
11

The laboratory process of distillation does not involve

Chemistry
2 answers:
Fiesta28 [93]3 years ago
7 0
Liquids with the same boiling points because they will evaporate at the same time leaving you without a solution.
riadik2000 [5.3K]3 years ago
5 0
C liquids with different boiling points, to distill you only use one liquid

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Past due! Help please I choose the middle picture for my hypothesis being inclusive can you help explain why and how it shows it
MrMuchimi

Answer:

Explanation:

its supposed to be not supported not inclusive because you said mix

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3 years ago
17. Physical properties of a material include all but ________________.
Amiraneli [1.4K]

Answer:

17)c: the reactivity of a metal.

Explanation:

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2 years ago
Is the reaction between methane and oxygen endothermic or exothermic? Explain why we burn fossil fuels, such as natural gas.
vladimir1956 [14]
The thing that governs whether a reaction is exothermic is the energy given out / used up to break / form the bonds in the reaction. 

<span>When two substances react, the bonds in those substances first break up, releasing energy, before re-forming in a different way, taking in energy. The nature of the bonds that are broken up and reformed determines whether more energy is given out (exothermic) or taken in (endothermic)</span>
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3 years ago
An unknown compound contains only carbon, hydrogen, nitrogen, and oxygen. Complete combustion of a 2.77 g sample of the compound
alisha [4.7K]

The molecular formula of the unknown compound is determined as  C₉H₁₁NO₂.

<h3>Molecular formula of the compound</h3>

The molecular formula is calculated as follows;

CHNO  +  O₂ ------------> CO₂  + H₂O

Mass of carbon, C:  = (6.64 x 12)/44 = 1.81 g in 2.77 g sample

Mass of hydrogen, H: = (1.67 x 2)/18 = 0.186 g in 2.77 g sample

Mass of Nitrogen, N: = (2.77 x 0.143)/1.69 = 0.234 g

Mass of oxygen, O:  = 2.77 g - 1.81 g - 0.186 g - 0.234 g = 0.54 g

<h3>molar ratio of the elements: </h3>

C = 1.81 g = 0.15 mol

H = 0.186 g = 0.186 mol

N = 0.234 g = 0.017 mol

O = 0.54 g = 0.0337 mol

divide through with the smallest number of moles (0.017 mol);

C = 9

H = 11

N = 1

O = 2

Molecular formula = C₉H₁₁NO₂

Check the molar mass of the compound = (9 x 12) + (11 x 1) + (14) + (2 x 16) = 165 g/mol

Thus, the molecular formula of the unknown compound is determined as  C₉H₁₁NO₂.

Learn more about molecular mass here: brainly.com/question/21334167

#SPJ1

4 0
1 year ago
Can someone help me with these. I don’t understand how to answer them or do the work
ICE Princess25 [194]
How am I supposed to help you if there's not picture of what the problem is
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3 years ago
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