Chemistry, 28.10.2019 07:31 teamzomaxx6584

What is the mass of a helium sample that contains 0.427 moles of he gas?

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Answer from: and7393

Easy moles to mass conversion :)

So, the first step would be our "given" over 1. Our given, is 0.427.

So, our first step would look like this:

0.427 mol He

1

For our second step, we need to cancel out moles. So, we would put one mole on the bottom of our second step, to cancel out. Whenever we use the periodic table to find molar mass in a conversion, it is ALWAYS one mole. To find grams, we will simply calculate the molar mass of helium, which is 4.003 (atomic mass on the periodic table)

Our second step would look like this:

4.003g He

1mol He

So, when we put the two steps together, it looks like this:

0.427mol He 4.003g He
x
1 1mol He

To find our answer, we:
Multiply the top numbers together (we get 1.709281)
Multiply the bottom numbers together (we get 1)

Then, we divide the top product together by the bottom product together.

1.709281/1

Our answer is 1.709281

So, from 0.427 moles of Helium, we get 1.709281 grams of Helium.

Answer from: Quest

explanation:

metals have excess of electrons whereas non-metals have deficiency of electrons. thus, in order to gain stability metals easily donate their electrons to the non-metals.

for example, electronic configuration of sodium is $1s^{2}2s^{2}2p^{6}3s^{1}$ and electronic configuration of phosphorous is $1s^{2}2s^{2}2p^{6}3s^{2}3p^{3}$ .

when a phosphorous atom and sodium atom combine together then sodium will donate is extra one electron to the phosphorous atom. as a result there will be formation of ionic bond between sodium and phosphorous.

the reaction will be as follows.

$3na + p \rightarrow na_{3}p$

there, are three sodium sodium atoms and each of them will donate its one extra electron to phosphorous atom. thus, the sub-shell of phosphorous gets completely filled.

thus, we can conclude that electrons are transferred from atoms of sodium to atoms of phosphorous. this transfer makes the sodium atoms donate one electron and the phosphorous atoms to gain one electron. as a result, the sodium and phosphorus atoms strongly attract each other.

Electrons are transferred from atoms of to atoms of this transfer makes the sodium atoms and the

Answer from: Quest

the answer is b & c i believe : )

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