CHEMISTRY COLLEGE

How many oxygen molecules in 2.3x10-⁸g of molecular oxygen

Answers

Answer 1

Answer:

Answer:

6.321 × 10^22

Explanation:

Mass of Oxygen =

3.36

Molar mass of oxygen (

) = 16 x 2 =

−

Total molecules in oxygen = Mass in grams/Molar mass x

3.36

6.02

6.321

Note:

(Avagadro's number) =

6.02

Hope it helps...

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Dry ice is solid carbon dioxide. Instead of melting, solid carbon dioxide sublimes according to the equation: CO2(s)→CO2(g). When dry ice is added to warm water, heat from the water causes the dry ice to sublime more quickly. The evaporating carbon dioxide produces a dense fog often used to create special effects. In a simple dry ice fog machine, dry ice is added to warm water in a Styrofoam cooler. The dry ice produces fog until it evaporates away, or until the water gets too cold to sublime the dry ice quickly enough. Suppose that a small Styrofoam cooler holds 15.0 L of water heated to 90 ∘C. Calculate the mass of dry ice that should be added to the water so that the dry ice completely sublimes away when the water reaches 28 ?
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A buffer solution is 0.413 M in HF and 0.237 M in KF. If Ka for HF is 7.2×10-4, what is the pH of this buffer solution?

How to determine acid base reactions

Answers

Answer : Acid-base reaction is determined when hydrogen ion of an acid neutralize by the hydroxide ion of a base then it gives water.

Explanation :

Acid-base reaction : It is defined as the reaction in which an acid reacts with a base to give salt and water.

Acid-base reaction is determined when hydrogen ion of an acid neutralize by the hydroxide ion of a base then it gives water.

For example: When hydrochloric acid react with sodium hydroxide base to give sodium chloride salt and water.

The balanced acid-base reaction is:

$HCl+NaOH\rightarrow NaCl+H_2O$

A particular refrigerant cools by evaporating liquefied CCl 2F 2. How many kg of the liquid must be evaporated to freeze a tray of water to ice (at zero degrees C)? The tray contains 525 grams water. Molar heat of fusion of ice = 6.01 kJ/mol. Molar heat of vaporization of CCl 2F 2 = 17.4 kJ/mole

Answers

Answer : The mass of $CCl_2F_2$ evaporated must be, 1.217 kg

Explanation :

First we have to calculate the moles of water.

$\text{Moles of water}=\frac{\text{Mass of water}}{\text{Molar mass of water}}$

Molar mass of water = 18 g/mol

$\text{Moles of water}=(525g)/(18g/mol)=29.17mol$

Now we have to calculate the heat released.

Heat released = Moles of water × Molar heat of fusion of ice

Heat released = 29.17 mol × 6.01 kJ/mol

Heat released = 175.3 kJ

Now we have to calculate the moles of $CCl_2F_2$

Heat = Moles of $CCl_2F_2$ × Molar heat of vaporization of $CCl_2F_2$

175.3 kJ = Moles of $CCl_2F_2$ × 17.4 kJ/mol

Moles of $CCl_2F_2$ = 10.07 mol

Now we have to calculate the mass of $CCl_2F_2$

$\text{Mass of }CCl_2F_2=\text{Moles of }CCl_2F_2* \text{Molar mass of }CCl_2F_2$

Molar mass of $CCl_2F_2$ = 120.9 g/mol

$\text{Mass of }CCl_2F_2=10.07mol* 120.9g/mol=1217.463g=1.217kg$

Thus, the mass of $CCl_2F_2$ evaporated must be, 1.217 kg

A rock has a mass of 15 grams and a volume of 5 cm3 what is the density of the object

Answers

Answer:

The answer is

3.0 g/cm³

Explanation:

To find the density of a substance when given the mass and volume we use the formula

$density = (mass)/(volume)$

From the question

mass = 15 g

volume of rock = 5 cm³

The density of the substance is

$density = (15)/(5)$

We have the final answer as

3.0 g/cm³

Hope this helps you

Final answer:

The density of an object is calculated by dividing its mass by its volume. In this case, the rock's density is 3 g/cm3.

Explanation:

The process to determine the density of an object involves dividing its mass by its volume. Here, the rock has a mass of 15 grams and a volume of 5 cm3. Thus, the density can be calculated by the formula:

Density = Mass / Volume.

Plugging the given numbers into this formula results in:

Density = 15 grams / 5 cm3.

Therefore, the density of the rock is 3 g/cm3.

Learn more about Density here:

brainly.com/question/34199020

#SPJ3

Increasing which factor will cause the gravitational force between two objects to decrease?weights of the objects
distance between the objects
acceleration of the objects
masses of the objects

Answers

Increasing distance between the objects factor will cause the gravitational force between two objects to decrease. Therefore, option B is correct.

What causes gravitational force to decrease?

The gravitational force grows in proportion to the size of the masses . The gravitational force weakens rapidly as the distance between masses grows. Unless at least one of the objects has a lot of mass, detecting gravitational force is extremely difficult.

Gravity is affected by object size and distance between objects. Mass is a unit of measurement for the amount of matter in an object.

The force of gravity is proportional to the masses of the two objects and inversely proportional to the square of the distance between them. This means that the force of gravity increases with mass but decreases as the distance between objects increases.

Thus, option B is correct.

To learn more about the gravitational force, follow the link;

brainly.com/question/12528243

#SPJ6

Answer:

Explanation:

Challenge question! One of the things hedoesn't mention is in order to use E=hf,
and any derivation of it, the energy must
be in JOULES. We have the energy in eV.
So this will be a two step question. First,
convert the energy to joules (or use the
number from our equation sheet) then
find the wavelength. Once you are done
with that, pick the correct answer below.
8.29x10^-16 m
3.75x10^26 m
2.48x10^-7 m
3.98x10^-26 m

Answers

bro this is too hard man can do just quit

Answer:

Explanation:

In a 66.0-g aqueous solution of methanol, CH4O, the mole fraction of methanol is 0.290. What is the mass of each component? g

Answers

Answer:

23.84g CH30H

32.81g H2O

Explanation:

We will be using the definition of mole fraction to determine the relationship between the number of moles of methanol,

CH3OH , and the number of moles of water.

But mole fraction gives the ratio between the number of moles of a component i of a solution to the total number of moles present in that solution.

CHECK THE ATTACHMENT FOR DETAILED EXPLANATION

Final answer:

In a 66.0g aqueous solution of methanol with a mole fraction of 0.290, the mass of the methanol is approximately 19.14g and the mass of the water is approximately 46.86g.

Explanation:

In this aqueous solution of methanol (CH4O), we know that its mass is 66.0g and the mole fraction of methanol is 0.290. The mole fraction is defined as the ratio of the number of moles of a component to the total number of moles of all components in the solution.

In order to find the mass of each component, namely the methanol and the water, we first need to establish that if the mole fraction of methanol is 0.290, the mole fraction of water must be 0.710 (because the total of all mole fractions in a solution is always equal to 1).

We then can set up the following proportion: mass of methanol/mass of water = mole fraction of methanol/mole fraction of water. After solving this equation, the mass of methanol will be approximately 19.14g and the mass of the water will be approximately 46.86g.