How many formula units make up 31.8 g of magnesium chloride (MgCl2)?

Answer 1

#2.01*10^23 "formula units MgCl"_2#

#(31.8 cancel("g MgCl"_2))* (1 cancel("mol MgCl"_2))/ (95.2 cancel("g MgCl"_2))* (6.02*10^23 "FU MgCl"_2)/ (1 cancel("mol MgCl"_2))=#

#2.01*10^23 "formula units MgCl"_2#

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Answer 2

Luna Chen

To find the number of formula units in 31.8 g of magnesium chloride (MgCl2), first calculate the molar mass of MgCl2.

Molar mass of MgCl2 = 24.305 g/mol (molar mass of Mg) + 2 * 35.453 g/mol (molar mass of Cl) Molar mass of MgCl2 = 95.21 g/mol

Next, divide the given mass by the molar mass to find the number of moles: Number of moles = 31.8 g / 95.21 g/mol

Finally, use Avogadro's number to convert moles to formula units: Number of formula units = Number of moles * Avogadro's number

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.