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Please select the true statements regarding units, mass and mole calculations, etc. a. The molecular weight of propane (C3H8 ) is 44 kg/kgmol and 44 g/kgmol. b. A solution is composed of two components. Component 1 and 2 are present in equal masses, but component 1 has double the molecular weight of component 2 . Thus, the moles of component 2 will be half the moles of component 1. c. The average molecular weight of a mixture of components present in varying molar proportions can be determined by taking the average of the molecular weights of the components. d. Time and area are examples of base units. e. The molecular weight of a substance like water in g/gmol is equivalent to the molecular weight in kg/kgmol and lb/lbmol.

User Sameerah
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1 Answer

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Answer:

Step-by-step explanation:

a. False. The correct molecular weight of propane (C3H8) is approximately 44 g/mol, not kg/kgmol or g/kgmol.

b. True. If component 1 and component 2 are present in equal masses but component 1 has double the molecular weight of component 2, then the moles of component 2 will indeed be half the moles of component 1. This is because moles are proportional to mass and inversely proportional to molecular weight.

c. True. The average molecular weight of a mixture of components present in varying molar proportions can be determined by taking the weighted average of the molecular weights of the individual components. This considers the contribution of each component based on its molar proportion.

d. False. Time and area are not base units in the International System of Units (SI). The base units of SI include length (meter), mass (kilogram), time (second), electric current (ampere), temperature (kelvin), amount of substance (mole), and luminous intensity (candela).

e. True. The molecular weight of a substance, like water, is the same regardless of whether it's expressed in g/gmol, kg/kgmol, or lb/lbmol. These are just different units for expressing the same value. The numerical value of the molecular weight remains constant regardless of the unit used for mass and amount of substance.

In summary, the correct statements are: b, c, and e.

User Alex Yatkevich
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