A student has a sample of isopropanol (C3H7OH) that has a mass of 78.6 g. The molar mass of isopropanol is 60.1 g/mol. How many moles of isopropanol are contained in this sample?

Answers

Answer 1

Answer: Number of moles:

mass of solute / molar mass

78.6 / 60.1 = 1.3078 moles

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If 0.25 mol of Br2 and 0.55mol of Cl2 are introduced into a 3.0-L container at 400 K, what will be the equilibrium concentration of BrCl ?? Br2(g)+Cl2(g) 2BrCl at 400 K, Kc= 7.0
Fe2O3 + H2 --> Fe + H2OA) what mass of hydrogen gas must be consumed to produe 10.0 g of iron metal?B) what mass of iron(lll) oxide, Fe2O3, must be consumed to prepare 2.50g of iron metal

If 20 atoms of aluminum react with 45 molecules of chlorine gas, which reactant is limiting and how many more atoms/molecules would be required to use up all the reactants?

Answers

Explanation:

$2Al+3Cl_2\rightarrow 2AlCl_3$

According to reaction, 2 atoms of aluminum gas reacts with 3 molecules of chlorine gas.

Then 20 atoms of aluminum will react with :

$(3)/(2)* 20=30 molecules$ of chlorine

Aluminum is a limiting reagent.

Molecules of chlorine left unreacted: 45 - 30 molecules = 15 molecules

Then 15 molecules of chlorine gas will react with :

$(2)/(3)* 15=10 atoms$ of aluminum

10 more atoms of aluminum will required to use up all chlorine.

Al:ch2 an molar ratio.

2:3 and an x. X is 30. 20/2 = 10 so an answer is

45/3 = 15. Both ratios are used

45 - 30 = 15 CL2 left.

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Why does vinegar dissolve in water but oil does not? A. Vinegar is nonpolar like water, but oil is polar. B. Vinegar is a pure substance, but oil is already a mixture. C. Vinegar is polar like water, but oil is nonpolar. D. Vinegar is a mixture, but oil is a pure substance like water.

Answers

The answer is C. Vinegar is polar like water, but oil is nonpolar this is due to the fact that if it dissolves in water it is mostly polar so the third choise represented above is definitely correct one.

Vinegar dissolve in water but oil does not because vinegar is polar like water, but oil is nonpolar and the correct option is option C.

The dissolving process depends on the polarity of the substances involved. Water is a polar molecule, meaning it has a positive and negative end, while vinegar contains acetic acid, which is also polar. Since both water and vinegar are polar, they can mix and dissolve in each other easily.

On the other hand, oil is nonpolar, meaning it lacks a positive and negative end. Because of this, oil cannot dissolve in water, which is polar. Instead, oil and water will separate into distinct layers. This phenomenon is due to the "like dissolves like" rule, where polar substances dissolve best in polar solvents and nonpolar substances dissolve best in nonpolar solvents.

Thus, the ideal selection is option C.

Learn more about Polar and nonpolar substances, here:

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Which of the following is an example of commensalism?

Answers

An example of commensalism is tick on a deer. Therefore, option A is correct.

What is commensalism ?

Another sort of symbiotic interaction is commensalism, in which one organism benefits and the other does not in any way suffer. Golden jackals will pursue tigers as they hunt in order to consume the tigers' leftovers.

The term "commensalism" is derived from the word "commensal," which in human social interaction refers to "eating at the same table," and which itself is derived through French from the Medieval Latin term "commensalis," which refers to "sharing a table," from the prefix com-, which means "together," and mensa, which refers to "table" or "meal."

The simplest definition of commensalism is that it is a form of symbiosis in which one organism gains while the other neither gains nor suffers harm. The three primary forms of commensalism are phoresy, metabiosis, and inquilinism.

Thus, option A is correct.

To learn more about commensalism, follow the link;

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Answer: A tick on a deer

Explanation:

because commensalism is a type of symbiotic relationship in which one species benefits, while the other species is neither harmed nor helped

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What is the theoretical yield of aluminum that can be produced by the reaction of 60.0 g of aluminum oxide with 30.0 g of carbon according to the following chemical equation? Al2O3 + 3C → 2Al + 3CO

Answers

Answer:

Theoretical yield = 31.8 g

Explanation:

The formula for the calculation of moles is shown below:

$moles = (Mass\ taken)/(Molar\ mass)$

For $Al_2O_3$

Mass of $Al_2O_3$ = 60.0 g

Molar mass of $Al_2O_3$ = 101.96128 g/mol

The formula for the calculation of moles is shown below:

$moles = (Mass\ taken)/(Molar\ mass)$

Thus,

$Moles= (60.0\ g)/(101.96128\ g/mol)$

$Moles_(Al_2O_3)= 0.5885\ mol$

Given: For $C$

Given mass = 30.0 g

Molar mass of $C$ = 12.0107 g/mol

The formula for the calculation of moles is shown below:

$moles = (Mass\ taken)/(Molar\ mass)$

Thus,

$Moles= (30.0\ g)/(12.0107\ g/mol)$

$Moles_(C)= 2.4978\ mol$

According to the given reaction:

$Al_2O_3+3C\rightarrow 2Al+3CO$

1 mole of aluminium oxide react with 3 moles of carbon

0.5885 mole of aluminium oxide react with $3* 0.5885$ moles of carbon

Moles of carbon = 1.7655 moles

Available moles of carbon = 2.4978 moles

Limiting reagent is the one which is present in small amount. Thus, aluminium oxide is limiting reagent.

The formation of the product is governed by the limiting reagent. So,

1 mole of aluminium oxide on reaction forms 2 moles of aluminium.

0.5885 mole of aluminium oxide on reaction forms $2* 0.5885$ moles of aluminium.

Moles of aluminium = 1.177 moles

Molar mass of aluminium = 26.981539 g/mol

Mass of sodium sulfate = Moles × Molar mass = 1.177 × 26.981539 g = 31.8 g

Theoretical yield = 31.8 g

SE DESEA OBTENER UNA SOLUCION 0.3 MOLARIDAD DE HIDROXIDO DE POTASIO DISOLVIENDO 60 GRAMOS DE HIDROXIDO -¿QUE VOLUMEN DE SOLUCION SE OBTENDRA QUIMICA

Answers

Answer:

3.56L will be the obtained volume

Explanation:

0.3 M → Molarity

These are the moles of solute (for this case, the solute is KOH) that are contianed in 1L of solution

We dissolved 60 g of solute, so let's determine the moles:

60 g . 1 mol/ 56.1 g = 1.07 moles

Molarity(mol/L) = Mol / Volume(L)

Let's replace data: 0.3M = 1.07 mol / Volume(L)

0.3 mol/L = 1.07 mol / volume

Volume = 1.07 mol / 0.3mol/L = 3.56 L

Why do gases take up so much space?

Answers

Gases take up so much space because the gas molecules are vibrating and moving very fast and in order to do this the molecules should as far as they could be to each other. They occur at low pressures and high temperatures where they can move freely in a container.

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