Concept explainers
Interpretation:
The molecular formula for hydrazine should be predicted.
Concept introduction:
The representation of atoms of a compound in simple whole number ratio is known as empirical formula.
Chemical formula or molecular formula represents the type of
The rules for determining empirical formula is given as follows:
- Determine the mass of elements in given compound.
- Calculate number of moles using molar mass of each compound or element.
- Divide each number of moles by smallest number of mole value calculated in second step.
- Round the value calculated in step 3 to nearest whole number.
Answer to Problem 215A
The molecular formula for hydrazine is
Explanation of Solution
Assuming the percentage is given by mass that means 87.45 g, and 12.55 g of nitrogen, and hydrogen are present in the vitamin D3.
1. Mass of nitrogen = 87.45 g
Mass of hydrogen = 12.55 g
Now, calculating the moles of nitrogen, and hydrogen using their molar mass as follows:
2. Now, dividing each mole value by smallest mole value as follows:
3. Thus, the empirical formula of hydrazine is
Now, n that is the ratio of given molar mass and empirical formula mass is calculated as follows:
The empirical formula mass is calculated as follows:
Calculation of n as follows:
Now, the number obtained will be multiplied to empirical formula as follows:
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