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Alexeev081 [22]
3 years ago
12

How to determine how many valence electrons an element has?

Chemistry
1 answer:
In-s [12.5K]3 years ago
8 0
Usually (ignoring transition metals, as they kinda get trickier), the element's valency can be found out by its group (column) number. Usually, we ignore the transition metal block while counting these columns, so Aluminium is in group 3, for example. Since Aluminium is in group 3, it has 3 valence electrons.
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Answer: Moles of hydrogen required are 4.57 moles to make 146.6 grams of methane, CH_{4}.

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Given: Mass of methane = 146.6 g

As moles is the mass of a substance divided by its molar mass. So, moles of methane (molar mass = 16.04 g/mol) are calculated as follows.

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