If the total mass of the products of a reaction is 250 g, what was the total mass of the reactants
Answers
The total mass in a reaction is always conserved . Thus the total mass of reactants will be equal to the total mass of products. Hence f the total mass of the products of a reaction is 250 g, the total mass of the reactants is also 250g.
What is law of conservation of mass ?
Mass conservation law is same as that of law of conservation of energy. That is, mass can neither be created nor be destroyed. Therefore, total mass of the system is conserved or it is a constant.
For any type of changes occurring for a substance, let it be a chemical change or physical change the total mass of the initial or original substance is gaines after the change from the new product or new state of the same substance.
Thus, no atoms created or lost in a reaction but they are regrouped to form new products. The new products are formed by bond making or bond breaking in the reactants their weight is completely transferred to the products.
Therefore, if a reaction is having total mass of 250 g in product side then it 250 g was the total mass in reactant side.
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Answer: 250 g
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If 2.70 mol C2H4 is reacted with 6.30 mol O2 identify the limiting reagent
Answers
The limiting reagent is O₂.
Firstly, write the balanced chemical equation:
C₂H₄ + O₂ → CO₂ + H₂O
Then, we need to write the mole ratio of the reactants
The theoretical mole ratio is given by the coefficients of the balanced chemical equation: 3 moles of O₂ react with 1 mol of C₂H₄
Now, let's write the mole ratio of the substances available
≈
We concluded that,
Since, the ratio of the O₂ to C₂H₄ available is less than the theoretical ratio of O₂ needed to react with C₂H₄, the former is not enough: it will be consumed before the other reagent and it is the limiting reactant.
Hence, the limiting reagent is O₂.
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Answer:
- The limiting reagent is O₂.
Explanation:
1. Write the balanced molecular equation:
2. Write the mole ratio of the reactants
The theoretical mole ratio is given by the coefficients of the balanced molecula equation: 3 moles of O₂ react with 1 mol of C₂H₄
3. Write the mole ratio of the substances available
4. Conclusion
Since the ratio of the O₂ to C₂H₄ available is less than the theoretical ratio of O₂ needed to react with C₂H₄, the former is not enough: it will be consumed before the other reagent and it is the limiting reactant.
Hence, the limiting reagent is O₂.