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ale4655 [162]
2 years ago
12

From what you know about helium and the elements in its group, which statement best explains why helium is placed where it is, i

nstead of the second column
Chemistry
2 answers:
bogdanovich [222]2 years ago
7 0

Answer:

I think it's because it shows properties that are similar to noble gases.

masha68 [24]2 years ago
4 0

Answer:

Helium is a noble gas and shares many properties with the other noble gases in the last column.

Explanation:

got it right

also it is classified as a noble gas, and hydrogen is a nonmetal so obviously they don't fit together, as the group is for alkali metals which Helium obviously isn't.

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Gaseous methane (CH4) will react with gaseous oxygen (O2) to produce gaseous carbon dioxide (CO) and gaseous water (H2O) . Suppo
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Answer:

0 g.

Explanation:

Hello,

In this case, since the reaction between methane and oxygen is:

CH_4+2O_2\rightarrow CO_2+2H_2O

If 0.963 g of methane react with 7.5 g of oxygen the first step is to identify the limiting reactant for which we compute the available moles of methane and the moles of methane consumed by the 7.5 g of oxygen:

n_{CH_4}=0.963gCH_4*\frac{1molCH_4}{16gCH_4}=0.0602molCH_4\\ \\n_{CH_4}^{consumed}=7.5gO_2*\frac{1molO_2}{32gO_2}*\frac{1molCH_4}{2molO_2} =0.117molCH_4

Thus, since oxygen theoretically consumes more methane than the available, we conclude the methane is the limiting reactant, for which it will be completely consumed, therefore, no remaining methane will be left over.

left\ over=0g

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