Zadanie 1b
Potassium also forms compounds with polyatomic ions. 2 KOH(aq) + Cu(NO3)2(aq) → Cu(OH)2(s) + 2 KNO3(aq) (i) 30.0 cm3 of a 0.380 mol dm−3 potassium hydroxide, KOH, solution is mixed with 25.0 cm3 of a 0.310…
Limiting reactant and theoretical yield
Identify the limiting and excess reactant from the amounts given, calculate the theoretical yield from the limiting reactant, and explain how experimental errors can make the experimental yield higher or lower than the theoretical one.
Tę umiejętność sprawdza 28 zadań wzorowanych na arkuszach IB z lat 2022–2026.
Zadania sprawdzające tę umiejętność: 28 Otwórz w wyszukiwarce z filtrami
Zadanie 3a
(i) Determine the enthalpy of combustion of pentane, in kJ mol−1, using table 12 in the data booklet. C5H12(g) + 8 O2(g) → 5 CO2(g) + 6 H2O(g) (ii) Calculate the mass, in g, of carbon dioxide, CO2, produced when 45.0 g of pentane react with…
Zadanie 18
Magnesium burns in oxygen according to the equation below. What is the limiting reactant when 3.0 mol of magnesium reacts with 2.0 mol of oxygen? 2 Mg(s) + O2(g) → 2 MgO(s) A. Mg B. O2 C. Both reactants are completely consumed D. Neither;…
Zadanie 19
Which substances will be present in the reaction vessel at the end of the reaction between 1.5 g of magnesium and 50.0 cm3 of 1.0 mol dm⁻³ hydrochloric acid? Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g) A. HCl(aq), MgCl2(aq) B. Mg(s),…
Zadanie 19
70 dm3 of nitrogen and 150 dm3 of hydrogen are mixed and react to form ammonia; all gas volumes are measured at the same temperature and pressure. N2(g) + 3 H2(g) → 2 NH3(g) What is the percentage yield of ammonia if 66 dm3 is obtained? A. 44 %…
Zadanie 3b
Deduce which reactant is limiting. Use sections 1, 4 and 7 of the data booklet.
Zadanie 3b
For the runs with 0.40 and 0.80 mol dm−3 HNO3(aq), suggest which reactant, CaCO3(s) or HNO3(aq), was the limiting reagent. Give a reason for your answer.
- Materiał graficzny
Zadanie 5a
90.0 cm3 of buta-1,3-diene and 150.0 cm3 of hydrogen are mixed in a container at 450 K and 101 kPa and react to form butane only. Determine the maximum volume of butane that can be formed, measured at the same temperature and pressure.
Zadanie 5b
Determine the total volume of gas present in the container at the end of the reaction described in 5a, under the same conditions of temperature and pressure.
Zadanie 18
What are the limiting reactant and the theoretical yield of hydrogen when 0.30 mol of aluminium reacts with 0.60 mol of hydrochloric acid? 2 Al(s) + 6 HCl(aq) → 2 AlCl3(aq) + 3 H2(g) In each option the limiting reactant is given first and the theoretical…
Zadanie 21
30 cm3 of butane was completely burned in 250 cm3 of oxygen according to the following equation. 2 C4H10(g) + 13 O2(g) → 8 CO2(g) + 10 H2O(l) What volume of oxygen remains unreacted, measured at the original conditions? A. 55…
Zadanie 4
0.30 dm3 of nitrogen is mixed with 0.60 dm3 of hydrogen and the mixture reacts as completely as possible. All gas volumes are measured at the same temperature and pressure. N2(g) + 3 H2(g) → 2 NH3(g) What volume of ammonia, in…
Zadanie 18
Sucrose, C12H22O11, is hydrolysed with excess water and the glucose formed is then fermented. C12H22O11(aq) + H2O(l) → 2 C6H12O6(aq) C6H12O6(aq) → 2 C2H5OH(aq) + 2 CO2(g) Mr of C12H22O11 = 342.34 Mr of…
Zadanie 19
Equal volumes of the gases Q2 and R2 are mixed in a sealed container and react until one of them is used up, forming the gas QR2. The volume of QR2 formed, measured under the same conditions, is 50 cm3.…
Zadanie 21
Nitrogen gas is reacted with excess hydrogen gas to produce ammonia. N2(g) + 3 H2(g) → 2 NH3(g) The reaction of 28.0 g of N2 with excess H2 produces 25.5 g of NH3. What is the percentage yield of NH3? A. 25% B. 50% C. 75% D.…
Zadanie 22
The dotted line shows the volume of hydrogen produced when an excess of magnesium ribbon is added to 50 cm3 of 2.0 mol dm−3 hydrochloric acid. Which curve shows the volume of hydrogen produced when the same excess of magnesium ribbon…
- Materiał graficzny
Zadanie 19
Ammonia is oxidized according to the equation below. 4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(g) What is the amount, in mol, of H2O produced when 8.00 mol of NH3 reacts with 5.00 mol of O2, if the yield is 80 %? A. 4.80 B. 6.00 C. 9.60 D.…
Zadanie 1a
(i) Determine the limiting reactant when 2.00 g of this powder reacts. (ii) Determine the volume, in dm3, of carbon dioxide released in the reaction in (i) at SATP. Use sections 1, 2 and 4 of the data booklet. (iii) A student collects 0.190…
Zadanie 2
8.00 mol of ammonia are mixed with 8.00 mol of oxygen. The equation for the reaction that occurs is shown below. 4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(g) What is the amount, in mol, of nitrogen(II) oxide, NO, produced, assuming that the reaction goes to…
Zadanie 4
Which species are present after 14 dm3 of ethyne has reacted with 20 dm3 of hydrogen to produce ethane? All gas volumes are measured at the same temperature and pressure. C2H2(g) + 2 H2(g) → C2H6(g) A. 14 dm3 of…
Zadanie 17
Excess zinc granules react with 40.0 cm3 of hydrochloric acid of concentration 1.00 mol dm−3 at 25 °C. The volume of hydrogen collected was measured over time and curve I was obtained. The experiment is repeated at the same…
- Materiał graficzny
Zadanie 3
Magnesium burns in oxygen. 2 Mg(s) + O2(g) → 2 MgO(s) What mass of magnesium oxide, in g, forms when 2.43 g of magnesium reacts with 3.41 dm3 of oxygen at STP? Mr(MgO) = 40.31; molar volume = 22.7 dm3 mol−1 A.…
Zadanie 3
A mixture of 44.1 g of propane and 192 g of oxygen is ignited and reacts until one reactant is used up, according to the equation. C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(l) Which substances are present in the vessel once the reaction has finished? A.…
Zadanie 3
A sealed vessel contains 4.41 g of propane and 24.0 g of oxygen, which react according to the equation. C3H8(g) + 5 O2(g) → 3 CO2(g) + 4 H2O(l) Which substances are present in the vessel after the reaction is complete? A. CO2(g) and H2O(l)…
Zadanie 29
A fixed amount of magnesium reacts with hydrochloric acid, which is added in increasing amounts. After each addition the reaction is allowed to finish. Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g) Which graph shows how the amount of hydrogen formed changes…
- Materiał graficzny
Zadanie 29
In a precipitation reaction, further portions of the excess reactant are added after the limiting reactant has been completely consumed. Which graph shows how the amount of precipitate formed depends on the amount of excess reactant added? A. Graph A B. Graph…
- Materiał graficzny
Zadanie 15
Identical pieces of zinc, each of mass 0.65 g, are added to two solutions of hydrochloric acid, X and Y, at the same initial temperature. Each reaction takes place in an identical insulated container and the mixture is stirred. Which statement is…
- Tabela do uzupełnienia
- Materiał graficzny
Zadanie 16
Excess calcium carbonate reacts with 25 cm3 of hydrochloric acid of concentration 1.0 mol dm−3 in an open flask. The solid line shows how the decrease in mass of the flask and its contents changes with time. The experiment is…
- Materiał graficzny