smelcher3900
27.09.2019 •
Chemistry
A45.2 mg sample of phosphorus reacts with selenium to form 131.6 mg of the phosphorus selenide. determine the empirical formula of phosphorus selenide. what will be the simplest molecular formula of this compound
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Ответ:
Phosphorus:
mass = 45.2 mg
molar mass = 30.97 mg / mmol
moles = 45.2 mg / (30.97 mg / mmol) = 1.46 mmol ≈ 1.5
Selenium:
mass = 131.6 mg – 45.2 mg = 86.4 mg
molar mass = 78.96 mg / mmol
moles = 86.4 mg / (78.96 mg / mmol) = 1.10 mmol ≈ 1
P1.5Se1
To get the empirical formula, we multiply with 2 to get whole numbers:
P3Se2
Ответ:
.
5 All of the molecules have the same kinetic energy
since the temperature is kept constant at 298 K
Explanation:
The AVERAGE kinetic energy is directly proportional to the absolute temperature.