Answer:
387.2092 g/mol
Explanation:
molarity = moles of solute / liters
Answer:
You can write either this answer (The geologic time scale (GTS) divides the history of the earth into eons, eras, periods, epochs, and ages)
or this answer (Scientists use the geologic time scale to illustrate the order in which events on Earth have happened.)
Explanation:
Answer:
P4Se3
Explanation:
Applying the Law of Conservation of Mass:
(133 mg total) - (45.8 mg P) = 87.2 mg Se
Dividing by the molar mass,
Phosphorus:-(45.8 mg P) / (30.97376 g P/mol) = 1.4786 mmol P
Selenium:-(87.2 mg Se) / (78.96 g Se/mol) = 1.1044 mmol Se
Divide by the smaller number of millimoles:
(1.4786 mmol P) / 1.1044 mmol = 1.339
(1.1044 mmol Se) / 1.1044 mmol = 1.000
multiply by 3, to get a whole number interger. then round to the nearest whole numbers to find the empirical formula.
Therefore the empirical formula is P4Se3