3 years ago

Which of the following atoms would gain two electrons to fill its valence energy level? (2 points) Ca Br S B

Chemistry

1 answer:

Andrei [34K]3 years ago

4 0

Sulfur is the answer according to the 2'8-8 rule

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How many grams of KNO3 would recrystallize from 100 g of water, if a saturated solution were cooled from 50 degrees celcius to 2

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$m_{cryst}=58g$

Explanation:

Hello there!

In this case, according to the attached solubility chart, it is possible for us to realize that about 88 grams of KNO3 are soluble at 50 °C but just 30 grams are soluble at 20 °C in the same 100 g of water.

In such a way, the crystalized mass of this solute can be calculated by subtracting the mass at 50 °C and the mass at 20 °C:

$m_{cryst}=88g-30g\\\\m_{cryst}=58g$

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