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A student has a 10.0g sample of CaBr2 . Show the setup of the calculation to determine the number of moles of CaBr2 in the sample. Include units in the setup.

Respuesta :

bhuvna789456

The moles of CaBr2 in the given sample is  0.30127 moles

Explanation:

Given,

CaBr2  Gram=10

we have,

Molar mass of CaBr2 = 199.886 g/mol

1 mole= 6.022×10^23

Mole= 10.00 g*6.022×10^23 /199.886 g/mol

Mole=0.30127 moles

The moles of CaBr2 in the given sample is  0.30127 moles

CintiaSalazar

Taking into account the definition of molar mass, the number of moles of CaBr₂ in the sample is 0.05 moles.

First of all you need to know that molar mass is the amount of mass that a substance, which can be an element or compound, contains in one mole. In the case of a chemical compound, it is calculated by adding the atomic masses of all the atoms that appear in its formula.

In this case, the corresponding atomic masses being:

  • Ca: 40 g/mole
  • Br: 79.9 g/mole

the molar mass of CaBr₂ is calculated as:

CaBr₂= 40 g/mole + 2×79.9 g/mole

CaBr₂= 199.8 g/mole

Then it is possible to apply the following rule of three: if 199.8 grams of CaBr₂ are present in 1 mole of the compound, 10 grams will be present in how many moles?

[tex]amount of moles=\frac{10 gramsx 1 mole}{199.8 grams}[/tex]

amount of moles=0.05 moles

In summary, the number of moles of CaBr₂ in the sample is 0.05 moles.

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