P has three unpaired electrons
Answer:
1280J are required.
Explanation:
Heat of fusion is defined as the amount of heat required to change its state from liquid to solid at its melting point at constant pressure.
As heat of fusion of gold is 64J/g, there are required 64J to melt 1g of gold at its melting point. The energy required to melt 20g is:
20g * (64J/g) =
1280J are required
The molarity of the hydrochloric acid, HCl solution given the data is 0.079 M
<h3>Balanced equation </h3>
HCl + NaOH —> NaCl + H₂O
From the balanced equation above,
- The mole ratio of the acid, HCl (nA) = 1
- The mole ratio of the base, NaOH (nB) = 1
<h3>How to determine the molarity of HCl </h3>
- Molarity of base, NaOH (Mb) = 0.137 M
- Volume of base, NaOH (Vb) = 16.1 mL
- Volume of acid, HCl (Va) = 27.9 mL
- Molarity of acid, HCl (Ma) =?
MaVa / MbVb = nA / nB
(Ma × 27.9) / (0.137 × 16.1) = 1
(Ma × 27.9) / 2.2057 = 1
Cross multiply
Ma × 27.9 = 2.2057
Divide both side by 27.9
Ma = 2.2057 / 27.9
Ma = 0.079 M
Thus, the molarity of the HCl solution is 0.079 M
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Answer:
A chemical element
Explanation:
A chemical element consists of only one type of atom.
The combustion reaction for Fe₃O₄ in an oxygen molecule O₂ yields Fe₂O₃.
The number of moles of Fe₃O₄ required to prepare 0.472 moles of Fe₂O₃ is:
0.315 moles
The reaction equation is:
From the above reaction;
4 moles of Fe₃O₄ react with oxygen to produce 6 moles Fe₂O₃.
i.e.
Fe₃O₄ : Fe₂O₃ = 4 : 6
Fe₃O₄ : Fe₂O₃ = 2 : 3
= 0.315 moles
Therefore, we can conclude that 0.472 moles of Fe₂O₃ are prepared from 0.315 moles of Fe₃O₄.
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