Question

16.- A byproduct of the reaction that inflates automobile air bags is sodium, which is very reactive and can ignite in air. The sodium produced during the inflation process reacts with another compound added to the bag's contents, KNO3, according to the reaction: 10Na + 2KNO3 → K2O + 5Na2O + N2 How many grams of KNO3 are needed to remove 5 g of Na? a) 11g b) 4.4g c) 2.2g d) 1.0g

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Answer to a math question 16.- A byproduct of the reaction that inflates automobile air bags is sodium, which is very reactive and can ignite in air. The sodium produced during the inflation process reacts with another compound added to the bag's contents, KNO3, according to the reaction: 10Na + 2KNO3 → K2O + 5Na2O + N2 How many grams of KNO3 are needed to remove 5 g of Na? a) 11g b) 4.4g c) 2.2g d) 1.0g

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Esmeralda
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101 Answers
Para resolver este problema, primero debemos calcular la masa molar de Na y KNO3.

1. Calculamos la masa molar del sodio (Na):
Na: \, M = 22.99 \, g/mol

2. Calculamos la masa molar del nitrato de potasio (KNO3):
KNO3: \, M = K (39.10) + N (14.01) + 3O (16.00) = 101.10 \, g/mol

3. Calculamos la proporción estequiométrica entre el sodio (Na) y el nitrato de potasio (KNO3) utilizando la ecuación química dada:
10Na + 2KNO3 \rightarrow K2O + 5Na2O + N2

Por cada 10 moles de Na, se necesitan 2 moles de KNO3.

4. Calculamos cuántos moles de Na están presentes en 5 g de Na:
Moles\_Na = \frac{5g}{22.99 \, g/mol} = 0.217 \, moles

5. Ahora utilizamos la relación estequiométrica para encontrar cuántos moles de KNO3 se necesitan para reaccionar con 0.217 moles de Na:
Moles\_KNO3 = \frac{0.217 \, moles \, Na}{10 \, moles \, Na} \times 2 \, moles \, KNO3 = 0.0434 \, moles \, KNO3

6. Finalmente, calculamos cuántos gramos de KNO3 corresponden a 0.0434 moles:
Gramos\_KNO3 = 0.0434 moles \times 101.10 \, g/mol = 4.38 \, g

Entonces, la cantidad de KNO3 necesaria para eliminar 5 g de Na es de 4.4 g. Por lo tanto, la respuesta correcta es:
\text{b) 4.4 g}

\textbf{Respuesta: b) 4.4 g}

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