Answers by visitors named: Krishna

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Molecules A and B react to produce molecule AB. If 60 mLs of 0.025 M A is added to 18 mLs of 0.175 M B, then how many moles of unreacted A or B will be left over? How many moles of AB will be produced?

I think almost everyone forgetting the first line of the problem." A VAMPIRES A TOWN AND BITES TWO PERSONS EVERY NIGHT ". 1st night= 2 (bitten by original vampire) 2nd night= 2 +4(bitten by 2 persons turned vampires previous night) 3rd night= 2 +4(bitten by 2 vampires turned previous night) +6(bitten by 4 vampires turned previous night) (proceding in this manner...) 4th night= 2+4+6+8 5th night= 2+4+6+8+10. Thus total vampires would be 1(original)+No.of.people bitten. NO.of.people bitten= 2(1st night)+6(2nd night)+12(3rd night)+20(4th night) +30(5th night) = 70. Totally, 71 vampires. correct me if i am wrong.

Consider a = (x^2 -17x +71) and b = (x^2 -34x +240). case 1: let a = 1, b may be anything. x^2 -17x +71 = 1, which gives x = 7 or 10. case 2: let b =0 and a non-zero. x^2 -34x +240 = 0, gives x = 10 or 24. case 3 : let a = -1 and b = even. x^2 -17x +71 = -1, gives x = 9 or 8. here only x = 8 is valid because, substituting 8 in the equation gives even value {(-1) ^ even = 1}. thus x = 7,10,24,8 satisfy the given problem. Sum of 7 + 10 + 24 + 8 = 49.

2 minutes

start: 0 cm 1st minute: 0 + 3 - 2 = 1 cm 2nd minute: 1 + 3 = 4 cm Therefore after 2 minutes the ant already climbed to the top (and didn't slip).

As the number of moles in the balanced chemical reaction is equal for both xe and the formed compound using weight by gram molecular weight for both calculate molecular weight of the compound.then substract the mass of xenon from the obtained molecular weight. At last we will obtain the molecular weight of all the flourine atoms in the compound.