Consider the reaction sequence from $P$ to $Q$ shown below. The overall yield of the major product $Q$ from $P$ is $75 \%$. What is the amount in grams of $Q$ obtained from $9.3 \,mL$ of $P ?$. (Use density of $P =1.00 \,g \,mL ^{-1}$; Molar mass of $C =12.0, H =1.0, O =16.0$ and $N =14.0 \,g \,mol ^{-1}$ )
Correct Answer: 18.6
Solution and Explanation
The molecular formula of Q = C16H12ON2
So, M. wt. of Q = 16 x 12 + 12 x 1 + 16 + 2 x 14
= 192 + 12 + 16 + 28
= 248 gm / mol
Moles of P =Moles of Q=\(\frac{9.3}{93}=0.1\)
So, amount of (Q) =\( 0.1 \times 248 \times 0.75 = 18.60\) gram
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Concepts Used:
Stoichiometry
Stoichiometry is founded on the law of conservation of mass where the total mass of the reactants equals the total mass of the products, leading to the insight that the relations among quantities of reactants and products typically form a ratio of positive integers. This means that if the amounts of the separate reactants are known, then the amount of the product can be calculated. Conversely, if one reactant has a known quantity and the quantity of the products can be empirically determined, then the amount of the other reactants can also be calculated.
Stoichiometry helps us determine how much substance is needed or is present. Things that can be measured are;
- Reactants and Products mass
- Molecular weight
- Chemical equations
- Formulas
Stoichiometric Coefficient
The Stoichiometric coefficient of any given component is the number of molecules and/or formula units that participate in the reaction as written.
Mole Ratios
The mass of one mole of a substance in grams is called molar mass. The molar mass of one mole of a substance is numerically equal to the atomic/molecular formula mass.