A gas evolved during the fermentation of sugar was collected. After purification

Question

A gas evolved during the fermentation of sugar was collected. After purification its volume was found to be 25.0 L at 22.5 degree C and 702 mmHg. How many moles of gas were collected? A. 0.95 mol B. 1.05 mol C. 12.5 mol D. 22.4 mol E. 724 mol How many grams of calcium chloride are needed to produce 10.0 g of potassium chloride? CaCl_2(aq) + K_2CO_3(aq) rightarrow 2 KCl(aq) + CaCO_3(aq) A) 0.134 g B) 7.44 g C) 14.9 g D) 29.8 g How many molecules of N_2 are in a 500.0 mL container at 780 mm Hg and 135 degree C? A) 8.76 times 10^21 B) 9.2 times 10^21 C) 2.65 times 10^22 D) 2.79 times 10^22 An "empty" aerosol can at 25 degree C still contains gas at 1.00 atmosphere pressure. If an "empty can is thrown into a 475 degree C fire, what is the final pressure in the heated can? A) 5.26 times 10^-2 atm B) 0.398 atm C) 2.51 atm D) 19.0 atm At STP how many liters of NH_3 can be produced from the reaction of 6.00 mol of N_2 with 6.00 mol of H_2? N_2(g) + 3 H_2(g) rightarrow 2 NH_3(g) A) 44.8 L B) 89.6 L C) 134 L D) 269 L Of the following, which element has the highest first ionization energy? A) beryllium B) boron C) hydrogen D) lithium

Explanation / Answer

45) Number of moles of gas,n= (PV)/(RT)

Where

P= pressure= 702 mm Hg *(1atm/760mm Hg)=0.924 ATM

V= volume=25.0L

R=gas constant=0.0821L ATM /(mol-K)

T = temperature=22.5oC=22.5+273=295.5K

Plug the values we get n= 0.95 mol

Therefore option (A) is correct

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