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Empirical Formulation of a Compound

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16. A compound contains 40.00% carbon, 6.67% hydrogen, and 53.33% oxygen. Determine the empirical formula of the compound.
Please help with the following problems.

1. Give the chemical formula for calcium phosphate.

2. A hypothetical element, Js, has three naturally occurring isotopes. The atomic mass and relative abundance of each isotope are: 35% 191 Js, 20% 185 Js,And 45% 192 Js. What atomic mass should be reported for this element?

3. A gas sample at 75 degrees C and 2.0 atm pressure occupy a volume of 2.5L. What volume will it occupy at STP?

4. Convert 200 degrees C to degrees F.

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Solution Preview

1. Assume that you have 100 g (1 g = 1%) of sample, calculate the moles for each element by dividing the mass by the molar mass (n = m/M). For C it will be 3.33 moles, H will be 6.60 moles, and O will be 3.33 moles. Next divide the number of moles for each element by the smallest value for moles, basically we are finding ...

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This posting helps with physical chemistry problems. The solution provides calculations and an explanation in over 200 words.

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