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Elodia [21]
3 years ago
10

Sodium has more valence electrons than magnesium. True or False

Chemistry
2 answers:
harkovskaia [24]3 years ago
7 0
False magnesium is in group 2 and has 2 outer electrons where as sodium is in group 1 and therefore only has 1 valence electron.
Tom [10]3 years ago
6 0
True. I hope this helps!

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A sample of hydrated copper (II) sulfate (CuSO4•nH2O) is heated to 150°C and produces 103.74 g anhydrous copper (II) sulfate and
wariber [46]

Answer:

5

Explanation:

Firstly, we convert what we have to percentage compositions.

There are two parts in the molecule, the sulphate part and the water part.

The percentage compositions is as follows:

Sulphate- (103.74)/(103.74 + 58.55) × 100% = apprx 64%

The water part = 100 - 64 = 36%

Now, we divide the percentages by the molar masses.

For the CuSO4 molar mass is 64 + 32 + 4(16) = 160g/mol

For the H2O = 2(1) + 16 = 18g/mol

Now we divide the percentages by these masses

Sulphate = 64/160 = 0.4

Water = 36/18 = 2

The ratio is thus 0.4:2 = 1:5

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Answer : The pressure of hydrogen gas is, 739.3 torr

Explanation :

As we are given:

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Pressure of hydrogen gas = Barometric pressure - Vapor pressure of water

Pressure of hydrogen gas = 758 torr - 18.7 torr

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3 0
3 years ago
Yo what is the moon phases​
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Answer:

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Explanation:

I hope this helps

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Explanation:

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