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2 years ago

How many moles of na contain 7.88x1021 atoms of na

Chemistry

1 answer:

labwork [276]2 years ago

7 0

Answer:

the answer to the qustion is 0.013089701 na

Explanation:

n/a

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Using the molarity equation, calculate how many grams of salt you need in order to make 80ml of a 2M solution (MW = 58.44g/mole)

ollegr [7]

Answer:

9.35g

Explanation:

The molarity equation establishes that:

$\textrm{molarity}=\frac{\textrm{moles of solute}}{\textrm{liters of solution}}$

So, we have information about molarity (2M) and volume (80 ml=0.08 l), with that, we can find the moles of solute:

$\textrm{moles of solute}=\textrm{molarity}*\textrm{liters of solution}$

$\textrm{moles of solute}= 0.08 \textrm{ l} *2\textrm{ M} = 0.16 \textrm{ mol}$

The mathematical equation that establishes the relationship between molar weight, mass and moles is:

$\textrm{molar weight}= \frac{\textrm{mass}}{\textrm{moles}}$

$\textrm{MW}= \frac{\textrm{m}}{\textrm{n}}$

We have MW (58.44g/mole) and n (0.16 mol), and we need to find m (grams of salt needed) to solve the problem:

$\textrm{m} = \textrm{MW * n}= 58.44\frac{\textrm{g}}{\textrm{mol}} * 0.16 \textrm{ mol} = 9.35 \textrm{ g}$

8 0

4 years ago

When our body temperature starts to increase, the blood flow to the skin increases and we produce large volumes of sweat, which

Troyanec [42]

I took the U.S.A
test prep and the answer is B

5 0

3 years ago

Read 2 more answers

What tool is used in an explosion site to chemically detect explosive residues on objects?

qaws [65]

Answer:

ion mobility spectrometer

Explanation:

it is an handheld chemical dectection device

Hope this helps

Please mark me as Brainliest

8 0

3 years ago

How do I find the average atomic weight of an element

fomenos

Answer:

To calculate the average atomic mass, multiply the fraction by the mass number for each isotope, then add them together.

hope this helps <3

7 0

3 years ago

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1. If a car is traveling 90 mi/hr, how many feet will the car travel in 1 sec? In 5 sec?

Fudgin [204]

Answer:

The car travel 660 feet

Explanation:

First convert the Speed into Feet/sec

Speed of the car = 90 mi/hr

1 mi = 5280 ft

In 90 miles = 90 x 5280 = 475,200 feet

1 hr = 60 min

1 min = 60 sec

So ,

1 hr = 60 x 60 sec = 3600 sec

The speed is defined as the distance traveled by the object in unit time. The formula of speed is :

$Speed =\frac{distance}{time}$

$Speed =\frac{90mi}{1hr}$ ... given

$Speed =\frac{475200 ft}{3600sec}$

Speed = 132 ft/sec

Now, time = 5 sec

$Speed =\frac{distance}{time}$

$distance =speed\times time$

$distance = 132ft/sec\times 5sec$

Distance = 660 feet

3 0

3 years ago