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 27 zadań wzorowanych na arkuszach IB z lat 2022–2026.
Zadania sprawdzające tę umiejętność: 27 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 24
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 25
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 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 3c
If the reaction with 0.80 mol dm−3 HNO3(aq) went to completion, the theoretical mass of CO2(g) released would be 1.76 g. (i) Use the graph to determine the mass, in g, of CO2(g) actually released in this reaction. (ii)…
- Materiał graficzny
Zadanie 4a
(i) Write a balanced equation, with state symbols, for this reaction. (ii) Deduce which of the two reactants runs out first, that is, which one limits the reaction. Use sections 1, 4 and 7 of the data booklet. (iii) Calculate the volume, in dm3,…
Zadanie 5b
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 23
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 27
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 2b
Student B pipetted 30.00 cm3 of the potassium hydroxide solution into a 150 cm3 glass beaker and added the nitric acid from a burette in portions of 4.00 cm3, recording the steady temperature after each addition. (i) From a…
- Tabela do uzupełnienia
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 24
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 25
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 27
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 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 3
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 3
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 21
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
Aluminium reacts with chlorine gas. 2 Al(s) + 3 Cl2(g) → 2 AlCl3(s) What mass of aluminium chloride, in g, forms when 2.70 g of aluminium reacts with 2.27 dm3 of chlorine at STP? Molar volume = 22.7 dm3 mol−1 A. 4.44 B. 8.89 C.…
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 38
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 38
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 2
A 0.030 mol sample of magnesium is added to 20.0 cm3 of hydrochloric acid of concentration 1.0 mol dm−3. Mg(s) + 2 HCl(aq) → MgCl2(aq) + H2(g) How many moles of hydrogen gas are produced? A. 0.010 B. 0.020 C. 0.030 D. 0.060
Zadanie 13
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 18
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