what is the total mass of excess reactants left over after the reaction is compl

Question

what is the total mass of excess reactants left over after the reaction is complete? Question 27 of 30 Incorrect General Chemistry 4th Edition University Science Books presented by Sapling Leaming Cryolite, NasAlFe(s), an ore used in the production of aluminum, can be synthesized using aluminum oxide. Tip: If you need to clear your Balance the equation. work and reset the equation, click the button that looks like two red arrows. lf 11.0 kilograms of Azoals, 58.4 kilograms of NaoH(n, nd 58.4 kilograms of HF(g) react completely, how many kilograms of cryolite will be produced? Number 45.26 kg Na,AIF. What is the total mass of the excess reactants left over Which reactants will be in excess? after the reaction is complete? AlzO3. Number NaOH kg. M HF x 10 o Previous check Answer o Next Exit

Explanation / Answer

Al2O3 + 6 NaOH + 12 HF   ---------------->2 Na3AlF6 + 9 H2O

moles of Al2O3 = 11 x 10^3 / 102 = 107.8

moles of NaOH = 58.4 x 1000 / 40 = 1460

moles of HF = 58.4 x 10^3 / 20 = 2920

Al2O3 + 6 NaOH + 12 HF   ---------------->2 Na3AlF6 + 9 H2O

1               6             12                                   2

107.8        1460       2920                                ?

here limiting reagent is Al2O3. because mol ratio of Al2O3 is less than that of both.

1 mol Al2O3   ---------------> 2 mol Na3AlF6

107.8 mol       --------------->        ??

moles of Na3AlF6 = 215.7 mol

mass of Na3AlF6 = 45.28 kg

excess reactants total mass = 1460 + 2920 = 4380

moles of NaOH left = 646.8

mass of NaOH reacted = 646.8 x 40 = 25872 g

mass of HI reacted = 1293.6 x 20 = 25872 g

total mass = 51744 g = 51.744 kg

excess reactants left over =116.8 - (51.744)

excess reactants left over = 65.06 kg

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.