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3 years ago

worth 20 points plus brainliest to whoever answer it correctly

Chemistry

1 answer:

malfutka [58]3 years ago

5 0

<u>Answer:</u> The correct answer is Option A.

<u>Explanation:</u>

To calculate the number of moles of a substance, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

We are given:

Given mass of fluorine = 6 grams

Now, to know the moles, we divide the given mass of fluorine by the atomic mass/molar mass of fluorine.

Thus, the correct answer is Option A.

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Trisha and her lab partner filled a beaker with 150 milliliters of a 0.10 M HCl solution. How many moles of HCl are in the beake

oksian1 [2.3K]

M=mol/liter
We know that we have 150ml=.15 L and .1 mol of HCl
Rearranging the molarity equation, we get
mol=M*l
mol=(.15)(.1)
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3 years ago

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a flask contains 2 gases. the first gas has a pressure of 0.76 atm and the second gas gas a pressure of 4,500 Pa. what is the to

Liula [17]

Answer:

The total pressure is 0,804 atm

Explanation:

We use Dalton's law according to which the sum of the partial pressures is equal to the total pressure of a gas mixture. We convert the pressure in Pascals to atmosphere (it can also be done in reverse):

101300Pa ----1 atm

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2 years ago

A solution is made containing 4.6 g of sodium chloride per 250g of water.

lozanna [386]

Answer:

$\large \boxed{1.81 \, \%}$

Explanation:

$\text{Mass percent} = \dfrac{\text{mass of solute} }{\text{mass of solution}} \times 100 \, \%$

Data:

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Mass of water = 250 g

Calculations:

Mass of solution = mass of NaCl + mass of water = 4.6 g + 250 g = 254.6 g.

$\text{\% m/m} = \dfrac{\text{4.6 g} }{\text{254.6 g}} \times 100 \, \% = \mathbf{1.81 \, \%}\\\\\text{The percent by mass of NaCl is $\large \boxed{\mathbf{1.81 \, \%}}$}$

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3 years ago

What type of resource are fossil fuels such as coal, oil, and natural gas?

alex41 [277]

They are non-renewable resources that formed when prehistoric plants and animals died and were gradually buried by layers of rock.

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2 years ago

If you know the atomic number and mass number of an atom of an element, how can you determine the number of protons, neutrons, a

ser-zykov [4K]

Answer:

You subtract the atomic number from the mass number to find the number of neutrons. If the atom is neutral, the number of electrons will be equal to the number of protons.

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2 years ago

** worth 20 points plus brainliest to whoever answer it correctly **

worth 20 points plus brainliest to whoever answer it correctly