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galina1969 [7]
2 years ago
9

What is the frequency of light that has an energy of 3.98 x 10-18 J

Chemistry
1 answer:
Dominik [7]2 years ago
8 0
This is what i have found i hope this helps

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PLEASEEEEEEEEEEEE HELPPPPPPPP I BEGGGGG FOR HELPPPPP
Elza [17]

Answer: There are 21.08\times 10^{23} molecules in 63.00 g of H_2O

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number 6.023\times 10^{23} of particles.

To calculate the moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}=\frac{63.00g}{18g/mol}=3.5moles

1 mole of H_2O contains =  6.023\times 10^{23} molecules

Thus 3.5 moles of H_2O contains =  \frac{6.023\times 10^{23}}{1}\times 3.5=21.08\times 10^{23} molecules.

There are 21.08\times 10^{23} molecules in 63.00 g of H_2O

3 0
3 years ago
Is alcohol evaporating a chemical or physical change
snow_tiger [21]
Physical change , the states are changing from liquid to gas
8 0
3 years ago
a blank in the speed of the molecules allows the attractions between atoms and a little closer together
anygoal [31]
Idk it’s there’s a picture(it won’t load or no picture) but when molecules move slow and are kidna packed together it is a solid
6 0
3 years ago
How many moles are in 60.05 g of carbon
Brrunno [24]

Answer:

moles =60.05/12

moles=5.0041

moles=5(approx)

5 0
3 years ago
How does ionization energy change from left to right on a period?
Olenka [21]

As the atomic radius decreases, it becomes harder to remove an electron that is closer to a more positively charged nucleus. They experience a weaker attraction to the positive charge of the nucleus. Ionization energy increases from left to right in a period and decreases from top to bottom in a group.

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3 years ago
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