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lana66690 [7]
4 years ago
7

What number would you write before water in the formula for calcium carbonate nonahydrate?

Chemistry
1 answer:
anyanavicka [17]4 years ago
7 0
Water is not part of that compound. What is the chemical equation?
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Which best describes a compound?
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Answer: A elements that are chemically combined

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At 20 °C the vapor pressure of pure benzene (C6H6) is 75.0 torr, and that of toluene (C7H8) is 22.0 torr. Assume that benzene an
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Answer:

mole fraction benzene = 0.62

mole fraction toluene   = 0.38

Explanation:

Raoults law for ideal solutions tells us that the totoal vapor pressure of the solution will be given by adding the partial pressures of the components of  the solution and the partial pressures are simply given by the product of the component in solution times its pure vapor pressure at the temperature given:

<h2>p total = x₁  P⁰₁ + x₂  P⁰₂</h2>

where x1 and x2 for this solution denote the mole fractions of  benzene and toluene and p⁰ ₁, p⁰₂ the vapor pressures of benzene and toluene respectively.

Solving the algebraic equation:

75 x₁ + 22 x₂  = 55

75 x₁ + 22 ( 1- x₁) = 55   (since x₁ + x₂ = 1)

75 x₁ + 22 - 22 x₁ = 55

53 x₁  = 33

x₁ = 0.62  

x₂ = 1 - 0.62 = 0.38

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What are the limitations of silver catalyst?
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