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torisob [31]
3 years ago
5

Calculate the number of moles of BaF2 in a 10.0 g sample of BaF2.

Chemistry
2 answers:
kari74 [83]3 years ago
6 0

Answer:

0.06moles

Explanation:

I did this question already and I got it right.

UkoKoshka [18]3 years ago
5 0

Answer:

The number of moles = 0.06 moles

Explanation:

i) Formula

Number of moles = Mass of the sample ÷ Molar masses of the substances

ii) Number of moles = 10.0 ÷ (137)+(19×2)

= 10.0 ÷ 175

= 0.06 moles

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An increase in the atmospheric concentrations of greenhouse gases produces a positive climate forcing, or warming effect. From 1990 to 2015, the total warming effect from greenhouse gases added by humans to the Earth's atmosphere increased by 37 percent.
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3 years ago
A 3.82 g piece of limestone contains 2.62 g of CaCO3
Kobotan [32]

Considering the definition of percentage by mass, the mass percentage of CaCO₃ is 68.59%.

<h3>What is mass percentage</h3>

The percentage by mass expresses the concentration and indicates the amount of mass of solute present in 100 grams of solution.

In other words, the percentage by mass of a component of the solution is defined as the ratio of the mass of the solute to the mass of the solution, expressed as a percentage.

The percentage by mass is calculated as the mass of the solute divided by the mass of the solution, the result of which is multiplied by 100 to give a percentage. This is:

mass percentage=\frac{mass of solute}{mass of solution}x100

<h3>Mass percentage of CaCO₃</h3>

In this case, you know:

  • mass of CaCO₃: 2.62 grams
  • mass of limestone: 3.82 grams

Replacing in the definition of mass percentage:

mass percentage=\frac{2.62 grams}{3.82 grams}x100

<u><em>mass percentage= 68.59 %</em></u>

Finally, the mass percentage of CaCO₃ is 68.59%.

Learn more about percentage by mass:

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1 year ago
Write a balanced chemical equation based on the following: Solid magnesium metal reacts with chlorine gas to produce solid magne
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Answer:

Mg + Cl2 = MgCl2

I hope it helps

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3 years ago
PLZ HELP ITS A TEST AND GIVE ME THE RIGHT ANSWER
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In which of the following is the number of neutrons correctly represented? A. fluorine: atomic number 9, mass 19, neutrons 0 B.
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D. uranium: atomic number 92, mass 238, neutrons 146

238-92=146
4 0
3 years ago
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