# Problem: Vitamin A has a molar mass of 286.4 g/mol and a general molecular formula of C xHyE, where E is an unknown element. If vitamin A is 83.86% C and 10.56% H by mass, what is the molecular formula of vitamin A?

###### FREE Expert Solution

Recall that the molecular formula of a compound is the actual molar ratio (ratio of moles) for each element.

For Vitamin A, the general molecular formula is given as: CxHyE, where E is an unknown element. Its molar mass is known to be: 286.4 g/mol, and it also contains 83.86% C, and 10.56% H by mass. We need to find the whole number values for x and y

To solve for the molecular formula of Vitamin A we need to do these steps:

1. Determine mass % of E
2. Based on the molar mass; determine the identity of element E
3. Determine the # of moles of C and H and E using the mass from step 1.
4. Get the whole number mole ratio of each element.
92% (385 ratings) ###### Problem Details

Vitamin A has a molar mass of 286.4 g/mol and a general molecular formula of C xHyE, where E is an unknown element. If vitamin A is 83.86% C and 10.56% H by mass, what is the molecular formula of vitamin A?

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Our data indicates that this problem or a close variation was asked in Chemistry: An Atoms First Approach - Zumdahl Atoms 1st 2nd Edition. You can also practice Chemistry: An Atoms First Approach - Zumdahl Atoms 1st 2nd Edition practice problems.