CHEMISTRY HIGH SCHOOL

Cholesterol has a formula of C27H46O. What is the mass in grams of one molecule of cholesterol?

Answers

Answer 1

Answer:

The mass in grams of one molecule of cholesterol, C27H46O is6.43×10⁻²² g

Avogadro's hypothesis

6.02×10²³ molecules = 1 mole of Cholesterol

But,

1 mole of Cholesterol = 387 g

Thus,

6.02×10²³ molecules = 387 g mole of Cholesterol

How to determine the mass of one molecule

6.02×10²³ molecules = 387 g mole of Cholesterol

1 molecule = 387 / 6.02×10²³

1 molecule = 6.43×10⁻²² g of Cholesterol

Thus, the mass of 1 molecule of cholesterol is 6.43×10⁻²² g

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Answer 2

Answer:

The molar mass of cholesterol = 386.654 g/mol = 387 g/mole

3.2 mg cholesterol x 1 g/1000 mg x 1 mole/387 g x 6.02x1023 molecules/mole = 5.0x1018 molecules.

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You are doing research on planet X. The temperature inside the space station is a carefully controlled 27 ∘C and the pressure is 761 mmHg . Suppose that a balloon, which has a volume of 855 mL inside the space station, is placed into the airlock, and floats out to planet X.If planet X has an atmospheric pressure of 0.14 atm and the volume of the balloon changes to 3.21 L , what is the temperature, in degrees Celsius, on planet X (n does not change)?

Express your answer using three significant figures.

Answers

Answer:

-115°C is the temperature on planet X.

Explanation:

Pressure inside the space station = $P_1=761 mmHg=(761)/(760)atm=1.00 atm$

1 atm = 760 mmHg

Temperature inside the space station = $T_1 = 27^oC = 27 + 273 K = 300 K$

Volume of the air filled in the balloon = $V_1=855 mL=0.855 L$

1 mL = 0.001 L

Atmospheric pressure on planet X = $P_2=0.14 atm$

Temperature on the planet X = $T_2=?$

Volume of the air filled in the balloon on planet X = $V_2=3.21 L$

Using combined gas equation :

$(P_1V_1)/(T_1)=(P_2V_2)/(T_2)$

$T_2=(P_2V_2* T_1)/(P_1V_1)$

$=(0.14 atm * 3.21 L* 300K)/(1.00 atm* 0.855 L)=157.7 K$

$T_2=157.7K=157-273^oC=-115.3^oC\approx -115^oC$

-115°C is the temperature on planet X.

Final answer:

Using the ideal gas law, the temperature on planet X is calculated to be approximately -148.5 °C, after converting all units to standard and then adjusting the final result from Kelvin to Celsius.

Explanation:

This is a classic problem in physics that uses the ideal gas law, which states that the pressure of a gas multiplied by its volume is directly proportional to the amount of gas and the temperature. Using the provided data about the initial conditions inside the space station and the final conditions on planet X, the final temperature can be found by using the equation P1V1/T1 = P2V2/T2, where P refers to pressure, V refers to volume, and T refers to temperature.

First, we need to convert all measurements to the standard units: Pressure in atm and volume in liters. So, initially the pressure inside the space station is 761 mmHg or approximately 1 atm (since 1 atm = 760 mmHg), the volume of the balloon is 855 mL or 0.855 L, and the temperature is 27 °C or 300.15 K (since 0 °C = 273.15 K). On planet X, the pressure is given as 0.14 atm and the volume as 3.21 L.

Substituting these values into our ideal gas law equation, we can find the final temperature T2 on planet X: T2 = P2V2T1 / P1V1 = (0.14 atm * 3.21 L * 300.15 K) / (1 atm * 0.855 L) = approximately 124.68 K.

To convert this value from Kelvin to degrees Celsius, we subtract 273.15, getting approximately -148.47 °C.

Therefore, the temperature on planet X is approximately -148.5 °C, given to three significant figures.

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What is the Arrhenius definition of a base? A substance that increases H3O+ concentration when it is dissolved in water. A substance that increases OH– concentration when it is dissolved in water. A compound that donates protons. A compound that accepts protons

Answers

Answer : The correct option is A substance that increases $OH^-$ concentration when it is dissolved in water.

Explanation :

Arrhenius Definitions :

Arrhenius Acid : It increases the concentration of hydronium ion $(H_3O^+)$ in an aqueous solution. In other words, a substance dissociates in water to form $H^+$ ion.

Arrhenius Base : It increases the concentration of hydroxide ion $(OH^-)$ in an aqueous solution. In other words, a substance dissociates in water to form $OH^-$ ion.

Answer:

Explanation:

The rising of cold water from deeper layers to replace warmer surface is calledA. Coriolus effect
B. Surface current
C. Upwelling
D. Reflection

Answers

Upwelling is the answer

Everything on earth is made of

Answers

- - Everything on earth is made of matter.Matter is all around you, everything you see and touch is matter.

Everything is made out of matter. More specifically atoms.

What is a disadvantage of using a structural model to show a chemical compound? Structural models provide minimal three-dimensional information. Structural models do not identify the number and type of each atom. Structural models cannot distinguish between single, double, and triple bonds. Structural models cannot distinguish between different isomers of a compound.

Answers

The answer is the first: that structural models provide minimal three-dimensional information. This is because the ball-and-stick model cannot show the actual size of the atoms depicted in the model. You also cannot see the actual bond lengths between the atoms. This, then, limits the accuracy of the model and fails to precisely portray how the chemical compounds being shown are like in all actuality. Thus, though you do see a three-dimensional picture of the chemical compound, this picture is not completely accurate and is not scaled to size.

Answer: A - Structural models provide minimal three-dimensional information.

Explanation:

Unknown compounds can usually be identified based solely on their _____. A. chemical properties
B. reactivity
C. volatility
D. physical properties

Answers

B reactivity because compounds are made of atoms and molecules and you need to know what they react to to know what they are made up of.

hysical proprerties i think

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