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What is the molarity of a solution that contains 15.0g of naoh per 500.0 ml of solution

VARVARA [1.3K]

Answer:

0.4 M

Explanation:

Molarity is defined as moles of solute, which in your case is sodium hydroxide,

NaOH

, divided by liters of solution.

molarity

=

moles of solute

liters of solution

Notice that the problem provides you with the volume of the solution, but that the volume is expressed in milliliters,

mL

.

Moreover, you don't have the number of moles of sodium hydroxide, you just have the mass in grams. So, your strategy here will be to

determine how many moles of sodium hydroxide you have in that many grams

convert the volume of the solution from milliliters to liters

So, to get the number of moles of solute, use sodium hydroxide's molar mass, which tells you what the mass of one mole of sodium hydroxide is.

7

g

⋅

1 mole NaOH

40.0

g

=

0.175 moles NaOH

The volume of the solution in liters will be

500

mL

⋅

1 L

1000

mL

=

0.5 L

Therefore, the molarity of the solution will be

c

=

n

V

c

=

0.175 moles

0.5 L

=

0.35 M

Rounded to one sig fig, the answer will be

c

=

0.4 M

8 0

3 years ago

BRAINLIEST IF CORRECT PLEASE USE WORK BONUS POINTS

cricket20 [7]

the answer is <em>a} physical and chemical changes</em>

5 0

3 years ago

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How do everyday activities like driving a car and using electricity lead to global warming ?

Sati [7]

Both driving a car and using electricity produce several greenhouse gases which can lead to global warming.Greenhouse gases are gases that, when released into the atmosphere, trap the heat from the sun's energy. Every day the energy from the sun reaches the earth. Some of the energy is reflected back into space and some of the energy is trapped by the earth's atmosphere. Most of the time the energy being trapped by the atmosphere serves to warm up the earth, so that the temperature does not fluctuate dramatically. In this way the atmosphere acts like a greenhouse - trapping the warmth in. One of the ways that electricity is made is by burning fossil fuels, like coal or fuel. When a fuel is burnt, some of the products are: carbon dioxide, carbon monoxide, and water - all of these gases are greenhouse gases. In a similar way driving a car also burns fossil fuels, and this will produce the same gases.<span>Before lots of fossil fuels were burnt the greenhouse gases in the atmosphere would have been moderated by the carbon cycle. However, if we burn excess fossil fuels we are producing excess greenhouse gases. This can cause more heat to be trapped by the atmosphere and therefore the global temperature will start to rise - global warming. hope i helped </span>

7 0

3 years ago

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What is the percent by mass of phosphorus?

topjm [15]

In what compund is it a part of?

3 0

3 years ago

Which of the following best defines molar heat capacity? Group of answer choices The quantity of heat required to raise the temp

motikmotik

Answer: The quantity of heat required to raise the temperature of 1 mole of a substance by 1K

Explanation:

As the temperature change is same in all scales of temperature.

The quantity of heat required to raise the temperature of a substance by one degree Celsius or one degree Kelvin or one degree Fahrenheit is called the heat capacity.

The quantity of heat required to raise the temperature of 1 gram of substance by one degree Celsius one degree Kelvin or one degree Fahrenheit is called as specific heat capacity.

The quantity of heat required to raise the temperature of 1 mole of substance by one degree Celsius or one degree Kelvin or one degree Fahrenheit is called as molar heat capacity.

8 0

3 years ago

PLZ HELP I NEED THIS TO GET DONE!​

PLZ HELP I NEED THIS TO GET DONE!