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crimeas [40]
3 years ago
10

How did Moseley establish a more accurate periodic table?

Chemistry
2 answers:
kompoz [17]3 years ago
6 0

the answer is b . i passed my test

GrogVix [38]3 years ago
4 0
<span>B.by arranging the elements according to atomic number instead of atomic mass</span> awnser is B
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We have a sample of water vapor which cools from 150 °C to 125 °C. What happens to the motion of the molecules during this time
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The motion of the molecules decreases.

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2 years ago
If 14.5 g of MnO4- (permanganate) react with manganese (II) hydroxide how many grams of manganese (IV) oxide will be produced? T
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Answer:

m_{MnO_2}=21.2gMnO_2

Explanation:

Hello,

In this case, given the balanced reaction:

2MnO_4^-+2Mn(OH)_2\rightarrow 4MnO_2+2OH^-+H_2O

We can see a 2:4 mole ration between permanganate ion (118.9 g/mol) and manganese (IV) oxide (86.9 g/mol), that is why the resulting mas of this last one turns out:

m_{MnO_2}=14.5gMnO_4^-*\frac{1molMnO_4^-}{118.9gMnO_4^-}*\frac{4MnO_2}{2molMnO_4^-}  *\frac{86.9gMnO_2}{1molMnO_2} \\\\m_{MnO_2}=21.2gMnO_2

Best regards.

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3 years ago
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zavuch27 [327]
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