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telo118 [61]
3 years ago
9

How many atoms are present in 34.69 moles of Mg

Chemistry
1 answer:
shusha [124]3 years ago
7 0
<span>Avogadro's number. 

1 mole of any substance, molecule or element is equal to a certain amount of atom. 

6.022 x 10^23 is the Avogradro's constant. 

Magnesium Oxide is a compound. therefore if you have 30.3 g of it (1 mol), it will have the same number of atoms. 

34.69 moles of MgO has 208.9 x 10^23 number of atoms. 

2.089 x 10^25 is also a correct answer.</span><span>
</span>
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3 years ago
What is the energy of a microwave photon that has a frequency of 9.86 x 1012 Hz?
BlackZzzverrR [31]

Answer:

6.533 × 10^-21J

Explanation:

The energy of the microwave photon can be calculated using:

E = hf

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f = frequency (9.86 x 10^12 Hz)

Hence, E = hf

E = 6.626 × 10^-34 × 9.86 x 10^12

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Answer:

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V₂ = V₁ + V' where V' = volume of water added.

So, From C₁V₁ = C₂V₂

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V' = 0.5 L - 0.102 L

= 0.398 L

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So, we need to add 398 mL of water to the nitric solution.

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