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4 years ago

PLEASE HELP!

Chemistry

1 answer:

iris [78.8K]4 years ago

4 0

Answer:

Explanation:

Ice caps are made from freshwater, so the melting would make there be less salt in the ocean water.

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3 years ago

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If 87 grams of K2SO4 (molar mass 174 grams) is dissolved in enough water to make 250 milliliters of solution, what are the conce

guapka [62]

Answer:

$M_{K^+}=4.0M \\\\M_{SO_4^{2-}}=2.0M$

Explanation:

Hello!

In this case, since the molarity of a solution is defined as the moles of solute divided by the volume of solution liters, given the mass of potassium sulfate, we can compute the moles by using its molar mass (174.24 g/mol):

$n_{K_2SO_4}=87gK_2SO_4*\frac{1molK_2SO_4}{174.27gK_2SO_4} =0.50molK_2SO_4$

Thus, since one mole of potassium sulfate has two moles of potassium ions (K₂) and one mole of sulfate ions, we can compute the moles of each ion as shown below:

$n_{K^+}=0.50molK_2SO_4*\frac{2molK^+}{1molK_2SO_4}=1.0molK^+\\\\ n_{SO_4^{2-}}=0.50molK_2SO_4*\frac{1molSO_4^{2-}}{1molK_2SO_4}=0.50molSO_4^{2-}\\$

In such a way, the molarity of each ion turns out:

$M_{K^+}=\frac{1.0mol}{0.250L}=4.0M \\\\M_{SO_4^{2-}}=\frac{0.5mol}{0.250L}=2.0M$

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3 years ago

Why are group 18 elements unable to form ionic bonds?

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