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swat32
3 years ago
14

How do you find a mole (i need an example) i hate chem pls help

Chemistry
1 answer:
galben [10]3 years ago
6 0

Answer:

I'm pretty sure its just the mass of the sample divided by the molar mass

for example if I had like 7g of carbon and wanted to find the moles, I would divide the mass I have (7g) by the molar mass (the atomic mass value on your periodic table, in this case for carbon it would be 14g)

moles = \frac{mass}{molarmass} = \frac{7}{14} = 0.5\ moles

Hope this helped

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A 3.25 L solution is prepared by dissolving 285 g of BaBr2 in water. Determine the molarity.
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Answer:

0.295 mol/L

Explanation:

Given data:

Volume of solution = 3.25 L

Mass of BaBr₂ = 285 g

Molarity of solution = ?

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Molarity is used to describe the concentration of solution. It tells how many moles are dissolve in per litter of solution.

Formula:

Molarity = number of moles of solute / L of solution

Number of moles of solute:

Number of moles = mass/ molar mass

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Number of moles = 285 g/ 297.1 g/mol

Number of moles= 0.959 mol

Molarity:

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4. When the following equation is balanced, what is the coefficient for HCI?
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Hey there!

Mg + HCl → MgCl₂ + H₂

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1 on the left, 2 on the right. Add a coefficient of 2 in front of HCl.

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Hope this helps!

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