116 g of `Fe _(3) O _(4)` has `1.5 ` moles of Fe. Calclate the molecular weight of `Fe _(3) O _(4)` without usng atomic weights of Fe and O.

Explanation

To calculate the molecular weight of `Fe_(3)O_(4)` without using the atomic weights of iron (Fe) and oxygen (O), we can follow these steps:

### Step 1: Understand the composition of `Fe_(3)O_(4)`
`Fe_(3)O_(4)` consists of 3 iron (Fe) atoms and 4 oxygen (O) atoms.

### Step 2: Determine the number of moles of `Fe_(3)O_(4)`
We know that 116 g of `Fe_(3)O_(4)` contains 1.5 moles of Fe. Since there are 3 moles of Fe in 1 mole of `Fe_(3)O_(4)`, we can find the number of moles of `Fe_(3)O_(4)` in the sample.

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