An aluminium atom has the atomic number 13 and the mass number 27. Which row shows the numbers of subatomic particles present in an aluminium ion, Al$^{3+}$? (b) Magnesium burns in excess oxygen to form magnesium oxide. The balanced equation for this reaction is 2Mg + O$_2$ → 2MgO Starting with 1.35g of magnesium, calculate the maximum mass of magnesium oxide that could be formed in this reaction. (relative atomic masses: O = 16.0, Mg = 24.0) You must show your working. Chlorine reacts with hydrogen to form hydrogen chloride.

GCSE Edexcel Chemistry Combined Science The mole: An aluminium atom has the atomic

An aluminium atom has the atomic number 13 and the mass number 27 - Edexcel - GCSE Chemistry Combined Science - Question 2 - 2019 - Paper 1

Question 2

An aluminium atom has the atomic number 13 and the mass number 27. Which row shows the numbers of subatomic particles present in an aluminium ion, Al$^{3+}$? (b) Ma... show full transcript

Worked Solution & Example Answer:An aluminium atom has the atomic number 13 and the mass number 27 - Edexcel - GCSE Chemistry Combined Science - Question 2 - 2019 - Paper 1

Step 1

Which row shows the numbers of subatomic particles present in an aluminium ion, Al$^{3+}$?

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Answer

An aluminium ion, Al $^{3+}$ , has 13 protons and 10 electrons (it loses 3 electrons). Therefore, it has:

Protons: 13
Neutrons: 14 (calculated as 27 - 13)
Electrons: 10 The correct row is therefore B.

Step 2

The balanced equation for this reaction is

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Answer

The balanced equation for the reaction of magnesium with oxygen is:

ightarrow 2 ext{MgO}$$

Step 3

calculate the maximum mass of magnesium oxide that could be formed in this reaction.

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Answer

First, calculate the moles of magnesium:

$ext{Moles of Mg} = rac{ ext{mass}}{ ext{molar mass}} = rac{1.35 ext{g}}{24.0 ext{g/mol}} = 0.05625 ext{mol}$

According to the balanced equation, 2 moles of Mg produce 2 moles of MgO. Therefore:

$ext{Moles of MgO formed} = 0.05625 ext{mol}$

Now, calculate the mass of magnesium oxide produced:

$ext{Mass of MgO} = ext{moles} imes ext{molar mass} = 0.05625 ext{mol} imes 40.0 ext{g/mol} = 2.25 ext{g}$

Thus, the maximum mass of magnesium oxide that could be formed is 2.25g.

An aluminium atom has the atomic number 13 and the mass number 27 - Edexcel - GCSE Chemistry Combined Science - Question 2 - 2019 - Paper 1

Worked Solution & Example Answer:An aluminium atom has the atomic number 13 and the mass number 27 - Edexcel - GCSE Chemistry Combined Science - Question 2 - 2019 - Paper 1

Which row shows the numbers of subatomic particles present in an aluminium ion, Al$^{3+}$?

The balanced equation for this reaction is

calculate the maximum mass of magnesium oxide that could be formed in this reaction.

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