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A solution X is 80% A and 20% B. Another solution Y is 60% B and 40% C. If 6 litres of Solution X is mixed with 2 litres of Solution Y, then what is the concentration of compound B in the final solution?
  • a)
    10 %
  • b)
    20 %
  • c)
    30 %
  • d)
    40 %
  • e)
    50 %
Correct answer is option 'C'. Can you explain this answer?
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Most Upvoted Answer
A solution X is 80% A and 20% B. Another solution Y is 60% B and 40% C...
Calculation:
To find the concentration of compound B in the final solution, we need to calculate the overall percentage of B in the mixture of solutions X and Y.

Step 1: Calculate the amount of compound B in each solution:
- Solution X: 80% of 6 litres = 4.8 litres of A and 1.2 litres of B
- Solution Y: 60% of 2 litres = 1.2 litres of B and 0.8 litres of C

Step 2: Calculate the total amount of compound B in the final solution:
- After mixing 6 litres of X and 2 litres of Y, the total amount of B = 1.2 litres + 1.2 litres = 2.4 litres

Step 3: Calculate the total volume of the final solution:
- Mixing 6 litres of X and 2 litres of Y gives a total volume of 6 litres + 2 litres = 8 litres

Step 4: Calculate the concentration of compound B in the final solution:
- Concentration of B = (Total amount of B / Total volume of the solution) * 100
- Concentration of B = (2.4 litres / 8 litres) * 100 = 30%
Therefore, the concentration of compound B in the final solution is 30%. So, the correct answer is option C.
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Community Answer
A solution X is 80% A and 20% B. Another solution Y is 60% B and 40% C...
6 litre of solution X having compound B = .2*6= 1.2 litre
2 litre of solution Y having compound B = .6*2 = 1.2litre
total litre =6+2=8litre
concentration = 2.4/8=0.3
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Directions: Read the Passage carefully and answer the question as follow.Caffeine, the stimulant in coffee, has been called“the most widely used psychoactive substance on Earth .”Synder, Daly and Bruns have recently proposed thatcaffeine affects behavior by countering the activity in(5) the human brain of a naturally occurring chemical calledadenosine. Adenosine normally depresses neuron firingin many areas of the brain. It apparently does this byinhibiting the release of neurotransmitters, chemicalsthat carry nerve impulses from one neuron to the next.(10) Like many other agents that affect neuron firing,adenosine must first bind to specific receptors onneuronal membranes. There are at least two classesof these receptors, which have been designated A1 andA2. Snyder et al propose that caffeine, which is struc-(15) turally similar to adenosine, is able to bind to both typesof receptors, which prevents adenosine from attachingthere and allows the neurons to fire more readily thanthey otherwise would.For many years, caffeine’s effects have been attri-(20) buted to its inhibition of the production of phosphodi-esterase, an enzyme that breaks down the chemicalcalled cyclic AMP.A number of neurotransmitters exerttheir effects by first increasing cyclic AMP concentra-tions in target neurons. Therefore, prolonged periods at(25) the elevated concentrations, as might be brought aboutby a phosphodiesterase inhibitor, could lead to a greateramount of neuron firing and, consequently, to behav-ioral stimulation. But Snyder et al point out that thecaffeine concentrations needed to inhibit the production(30) of phosphodiesterase in the brain are much higher thanthose that produce stimulation. Moreover, other com-pounds that block phosphodiesterase’s activity are notstimulants.To buttress their case that caffeine acts instead by pre-(35) venting adenosine binding, Snyder et al compared thestimulatory effects of a series of caffeine derivatives withtheir ability to dislodge adenosine from its receptors inthe brains of mice. “In general,” they reported, “theability of the compounds to compete at the receptors(40) correlates with their ability to stimulate locomotion inthe mouse; i.e., the higher their capacity to bind at thereceptors, the higher their ability to stimulate locomo-tion.” Theophylline, a close structural relative of caffeineand the major stimulant in tea, was one of the most(45) effective compounds in both regards.There were some apparent exceptions to the generalcorrelation observed between adenosine-receptor bindingand stimulation. One of these was a compound called3-isobuty1-1-methylxanthine(IBMX), which bound very(50) well but actually depressed mouse locomotion. Snyderet al suggest that this is not a major stumbling block totheir hypothesis. The problem is that the compound hasmixed effects in the brain, a not unusual occurrence withpsychoactive drugs. Even caffeine, which is generally(55) known only for its stimulatory effects, displays thisproperty, depressing mouse locomotion at very low concentrations and stimulating it at higher ones.Q.According so Snyder et al, caffeine differs from adenosine in that caffeine

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A solution X is 80% A and 20% B. Another solution Y is 60% B and 40% C. If 6 litres of Solution X is mixed with 2 litres of Solution Y, then what is the concentration of compound B in the final solution?a)10 %b)20 %c)30 %d)40 %e)50 %Correct answer is option 'C'. Can you explain this answer?
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