I usually don't ask for answers like this but my teacher does not offer retakes and I am so confused in chem so if anyone could help I would be so grateful.
question 1: 4Al + 3O₂ → 2Al₂O₃ How many grams of Aluminum are needed if you have 1.20 moles of aluminum oxide? *
10 points
43.2 g
64.8 g
57.6 g
173 g
question 2: 4Fe + 3O₂ → 2Fe₂O₃ Given: 5.78 moles of iron, how many moles of oxygen are needed? *
10 points
4.34 mol
3.78 mol
2.84 mol
90.7 mol
question 3: N₂(g) + 3H₂(g) 2NH₃(g) There is 6.41 grams of hydrogen, how many moles of ammonia are present? *
10 points
2.27 mol
1.14 mol
2.14 mol
2.56 mol
question 4: 2P₂O₅ + 6H₂O 4H₃PO₄ Given: 4.5 grams of H₂O, how many moles of H₃PO₄ are needed? *
10 points
0.083 mol
0.75 mol
1.5 mol
0.17 mol
question 5: 2P₂O₅ + 6H₂O 4H₃PO₄ If you have 1.5 moles of H₂O, how many grams of P₂O₅ would you need? *
10 points
1917 g
213 g
71 g
98 g
question 6: F₂ + 2 NaBr → 2 NaF + Br₂ What is the correct setup of ratios to determine the mass of Bromine produced when 0.789 moles of sodium bromide are present? *
10 points
0.789 x (83/1) x (2/1)
0.789 x (1/83) x (1/2)
0.789 x (1/2) x (160/1)
0.789 x (2/1) x (160/1)
question 7: 2Al + 3Cl₂ 2AlCl₃ If you have 6.5 mol of Al, how many grams of Cl₂ are needed? *
10 points
480 g
213 g
240 g
692 g
question 8; 4Al + 3O₂ → 2Al₂O₃ Given 6.20 moles of aluminum oxide, how many grams of oxygen are needed? *
10 points
111 g
250 g
298 g
335 g
question 9: F₂ + 2 NaBr → 2 NaF + Br₂ What is the correct setup of ratios to determine the mass of sodium fluoride produced when 0.789 moles of fluorine are present? *
10 points
0.789 x (2/2) x (42/1)
0.789 x (2/1) x (1/42)
0.789 x (1/2) x (38/1)
0.789 x (2/1) x (42/1)
question 10: N₂(g) + 3H₂(g) 2NH₃(g) There is 5.41 grams NH₃, how many moles of hydrogen are needed? *
10 points
454 mol
0.477 mol
0.580 mol
16.2 mol
Answers: 3
Chemistry, 22.06.2019 09:00, boxergirl2062
Scientific evidence tells us that the cause of earths four season is the tilt of earth as it revolves around the sun. the student is instructed to illustrate this information in a science notebook. how will the student illiterate winter in the northern hemisphere?
Answers: 3
I usually don't ask for answers like this but my teacher does not offer retakes and I am so confused...
Mathematics, 17.06.2021 20:00
Mathematics, 17.06.2021 20:00