Answer:
We can assume that allforceactingontheboxarebalancedinalldirections.
The mass in grams of one molecule of cholesterol, C27H46O is6.43×10⁻²² g
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
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
Learn more about Avogadro's number:
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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.
Answer:
C) The mass of the system remains constant during a change of state.
Explanation:
During a change of state (such as melting, boiling, or condensation), the mass of a closed system remains constant. This principle is based on the law of conservation of mass, which states that mass cannot be created or destroyed; it can only change forms or be transferred between components of the system
Cr(SO4)2
The number of orbitals you get per energy level can be found using this formula:
no. of orbitals=n²
Each orbital can hold a maximum of two electrons, the formula would be:
no. of electrons=2n²
Using the given formulas:
no. of orbitals = n² = 2² = 4
no. of electrons =2 * 4 = 8
chemical precipitation of a solid
production of a gas
change in volume
Answer: Option (d) is the correct answer.
Explanation:
A change that does not cause any difference in chemical composition of a substance are known as physical change.
For example, shape, size, mass, volume, density, etc of a substance are all physical changes.
And, a change that causes changes in chemical composition of a substance is known as chemical change.
For example, precipitation, reactivity, toxicity etc are chemical change.
Therefore, change in temperature, chemical precipitation of a solid, production of a gas are all indications of a chemical change.
Thus, we can conclude that change in volume would not necessarily indicate a chemical reaction.
Of the options provided, a change in volume would not necessarily indicate a chemical reaction. It could also be a sign of a physical change, such as a change in state.
The question is asking which of the listed factors would not necessarily indicate that a chemical reaction has taken place. From the options provided, a change in volume is not necessarily indicative of a chemical reaction. Other signs (like change in temperature, chemical precipitation of a solid, or production of a gas) are often valid signs of a chemical reaction, however, just a volume change could also be a sign of a physical change, such as a change in state from solid to liquid, or liquid to gas.
For example, when ice melts to water, or water evaporates to steam, it experiences a change in volume. This does not involve the forming or breaking of chemical bonds, thus it's not a chemical reaction, but a physical change.
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