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Natali [406]
3 years ago
10

Which statement describes the relative energy of the electrons in the shells of a calcium atom?

Chemistry
1 answer:
Zina [86]3 years ago
7 0
The answer is (3) An electron in the third shell has more energy than an electron in the second shell. The energy of electron will increase when number of shell increase.
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Consider the reaction 2Al + 6HBr → 2AlBr3 + 3H2. If 8 moles of Al react with 8 moles of HBr, what is the limiting reactant?
TiliK225 [7]

Answer:- HBr is limiting reactant.

Solution:- The given balanced equation is:

2Al+6HBr\rightarrow 2AlBr_3+3H_2

From this equation, There is 2:6 mol or 1:3 mol ratio between Al and HBr. Since we have 8 moles of each, HBr is the limiting reactant as we need 3 moles of HBr for each mol of Al.

The calculations could be shown as:

8molAl(\frac{6molHBr}{2molAl})

= 24 mol HBr

From calculations, 24 moles of HBr are required to react completely with 8 moles of Al but only 8 moles of it are available. It clearly indicates, HBr is limiting reactant.

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PV = nRT. Where P = pressure, V = volume, n = number of moles, R = universal gas constant and T = temperature. Hope this helps!
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3 years ago
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How many moles of iron can be produced from 4.20 moles of iron (III) oxide?
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Hope this helps, have a nice day ahead!

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What is the [H+] if the pH of a
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[\text{H}^{+}] = 10^{-\text{pH}}

[\text{H}^{+}] = 10^{-1.65}

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