Answer:
- <em>The unknown integer X in the formula is </em><u>5</u><em>.</em>
Explanation:
<u>1) Data:</u>
a) Mass of CuSO₄ ∙ XH₂O = 1.50 g
b) Mass of CuSO₄ = 0.96
c) X = ?
<u>2) Additional needed data:</u>
a) Molar Mass of CuSO₄ = 159,609 g/mol
b) Molar mass of H₂O = 18,01528 g/mol
<u>3) Chemical principles and formulae used:</u>
a) Law of conservation of mass
b) Molar mass = mass in grams / number of moles = m / n
<u>4) Solution:</u>
a) Law of conservation of mass:
- Mass of CuSO₄ ∙ XH₂O = mass of CuSO₄ + mass of H₂O
- 1.50g = 0.96g + mass of H₂O ⇒ mass of H₂O = 1.50g - 0.96g = 0.54g
b) Moles
- CuSO₄: n = 0.96g / 159.609 g/mol = 0.0060 mol
- H₂O: 0.54g / 18.01528 g/mol = 0.030 mol
c) Proportion:
Divide both mole amounts by the least of the two numbers, i.e. 0.0060
- CuSO₄: 0.0060 / 0.0060 = 1
- H₂O: 0.030 mol / 0.0060 = 5
Then, the ratio of CuSO₄ to H₂O is 1 : 5 and the chemical formula is:
Hence, the value of X is 5.
Explanation:
Deliquescent substances are solids that absorb moisture from the atmosphere until they dissolve in the absorbed water and form solutions. Efflorescent: Efflorescent substances are solids that can undergo spontaneous loss of water from hydrated salts.
Answer:
A. the electrons in metals are shared so that the bond between them is too strong to be broken by pounding.
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Answer:
Noble gases tend not to react with anything.
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