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luda_lava [24]
2 years ago
6

What is the mass of 3.0 x x times 10^23 atoms of neon?

Chemistry
1 answer:
Sladkaya [172]2 years ago
7 0

Answer:

10.09 grams

Explanation:

First you need to know the number of moles you are dealing with.

If you know that each mole has 6.022x10²³ of something (in this case of atoms), you can divide 3x10²³ atoms of neons by 6.022x10²³ to obtain the number of moles.

You have 0.5 moles of Neon, so then by the periodic table, you see that the molar mass of neon is 20.18g/mol, so by each mole you have 20.18 grams of neon. Multiply 20.18 grams by 0.5 moles and you got 10.09 grams of Neon

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Ca(OH)2 (s) precipitates when a 1.0 g sample of CaC2(s) is added to 1.0 L of distilled water at room temperature. If a 0.064 g s
borishaifa [10]

Answer:

Ca(OH)2 will not precipitate because Q<Ksp

Explanation:

Ksp for Ca(OH)2 has already been stated in the question as 8.0 x 10-8mol2dm-6

The value of the reaction quotient depends heavily on the concentration of the reactants. As the initial concentration of the calcium carbide decreases considerably, the reaction quotient decreases until Q<Ksp hence the Ca(OH)2 will not precipitate from solution.

The reaction equation is:

CaC₂(s) + H₂O ⇒ Ca(OH)₂ + C₂H₂

From

Ca(OH)2= Ca2+ + 2OH-

Concentration of solution= 0.064×1/64= 1×10-3

Since [Ca2+] = 1×10-3

[OH-]= (2×10-3)^2= 4×10^-6

Hence Q= 4×10^-9

This is less than the Ksp hence the answer.

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3 years ago
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Ty thinks it's strange that a person with an Asian-sounding name speaks Spanish as her primary language. Ty's thoughts are an ex
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The correct answer is c
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A student reports the following measurements for a set of pennies: 102.0mL, 91.0 g. What is the density of the pennies.
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Answer:

V = 102.0 ml

m = 91.0 ml

density = ...?

density = m / V

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= 0.89215 g/ml

7 0
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If the actual yielsd of a reaction is 50 g and the theoretical yield is 60 g. What is the percent yield.
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M₁=50 g
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3 years ago
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