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gulaghasi [49]
3 years ago
14

Which element is present in all organic compounds?

Chemistry
2 answers:
Mkey [24]3 years ago
5 0
The anser is 1, carbon
Karolina [17]3 years ago
5 0
Carbon is a basic element in all organic compounds, so (1) is the best choice.
Hope this would help:))
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Question 2(Multiple Choice Worth 4 points)
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B. Construct a hypothesis

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The rock cycle allows for an igneous rock to turn into what type of rock
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metamorphic rock

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Explanation:

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A student dissolves of styrene in of a solvent with a density of . The student notices that the volume of the solvent does not c
raketka [301]

Answer:

0.576M and 0.655m

Explanation:

<em>...Dissolves 15.0g of styrene (C₈H₈) in 250.mL of a solvent with a density of 0.88g/mL...</em>

<em />

Molarity is defined as moles of solute (Styrene in this case) per liter of solution whereas molality is the moles of solute per kg of solvent. Thus, we need to find the moles of styrene, the volume in liters of the solution and the mass in kg of the solvent as follows:

<em>Moles styrene:</em>

Molar mass C₈H₈:

8C = 12.01g/mol*8 = 96.08g/mol

8H = 1.005g/mol* 8 = 8.04g/mol

96.08g/mol + 8.04g/mol = 104.12g/mol

Moles of 15.0g of styrene are:

15.0g * (1mol / 104.12g) = 0.144 moles of styrene

<em>Liters solution:</em>

250mL * (1L / 1000mL) = 0.250L

<em>kg solvent:</em>

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0.144 moles / 0.250L =

<h3>0.576M</h3>

Molality is:

0.144 moles / 0.220kg =

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3 years ago
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The kinetic energy of a substance's particles in the liquid phase compare to their kinetic energy in the gas phase in a way that the particles have less kinetic energy in the liquid phase than they do in the gas phase.
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4 years ago
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