[rore-al-raja]

يــآليت أحــد يفهمني هـذي الأسألة ,,

The fertilizer ammonium sulfate [(NH4)2SO4] is prepared by the reaction between ammonia (NH3) and sulfuric acid:
2NH3(g) + H2SO4(aq)  (NH4)2SO4(aq)
How many kilograms of NH3 are needed to produce 1.00  105 kg of (NH4)2SO4?


-1 1.70x 104 kg
-2 3.22x 103 kg
-3 2.58x 104 kg
-4 7.42x 104 kg





Nitric oxide (NO) reacts with oxygen gas to form nitrogen dioxide (NO2), a dark-brown gas:
2NO(g) + O2(g)  2NO2(g)
In one experiment 0.886 mole of NO is mixed with 0.503 mole of O2. Calculate the number of moles of NO2 produced (note: first determine which is the limiting reagent).


0.886-1 mol
0.503-2 mol
1.01-3 mol
1.77-4 mol





Hydrogen fluoride is used in the manufacture of Freons (which destroy ozone in the stratosphere) and in the production of aluminum l. It is prepared by the reaction
CaF2 + H2SO4  CaSO4 + 2HF
In one process 6.00 kg of CaF2 are treated with an excess of H2SO4 and yield 2.86 kg of HF. Calculate the percent yield of HF.

93.0-1 %
95.3-2 %
47.6-3 %
62.5-4 %


هذا السؤال طلعلي الجــواب (1) مدري صح ولا لا ..؟!

Consider the combustion of carbon monoxide (CO) in oxygen gas:
2CO(g) + O2(g)  2CO2(g)
Starting with 3.60 moles of CO, calculate the number of moles of CO2 produced if there is enough oxygen gas to react with all of the CO.

7.20-1 mol
44.0-2 mol
3.60-3 mol
1.80-4 mol


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