Sindy

This page lists questions and answers that were posted by visitors named Sindy.

Questions

The following questions were asked by visitors named Sindy.

I got 2 questions and I've been stuck on them for days and its due in 2 days. 1. For a quick way of doing multiplication, you can do: for example: 81 x 89=? First you do 1x9=9 in which case you have to add '0' in front of it to make it 09. Then you add 1...

animals cause ___________________ weathering by burrowing in and moving underground soil around.

If a student needs to prepare 50g of bromobenzene and expects no more than a 75% yieldl, how much benzene should the student begin with if the yield is 75%? C6H6(l)+ Br2(l) --> C6H5Br(l)+ HBr(g) I calculated the moles of C6H5Br as .3185. But ion the end m...

What is the mass of La2(C2O4)3*9H2O, can be obtained from 650mL of 0.0170 M aq solution of LaCl3 by adding a stoichiometric amount of sodium oxalate. I don't know how to balance the equation for this..i started: LaCl3+ Na2C2O4 -> La2(C2O4)3*9H2O + NaCl

The combustion of benzoic acid releases 26.38kJ/g and is often used to calibrate a bomb calorimete. The combustion of 1.045g of benzoic acid caused the temperature of the calorimeter to rise by 5.985 degreeC.Using the same calorimeter, a sample of 0.876g...

Two bike riders X and Y both start at 2 pm riding towards each other from 40 km apart. X rides at 30 km/h, Y at 20 km/h. If they meet after t hours, find when and where they meet.

I'm really struggling with word problems right now. Got through 20 just three left. Can someone please give me some pointers or the first few steps? 1. A sum of money is divided between A, B and C in the ratio 1 : 2 : 3. However, before the money is divid...

Any help with the following would be greatly appreciated. I don't understand how to use the information given to create the equation. 1) A car travels between A and B at an average speed of 60 km/h. If the car increased its average speed to 100 km/h it wo...

The coordinates of triangle ABC areA(0,0), B(2,6), and C(4,2). Using coordinates geometry; prove that, if the midpoints of sides AB and AC are joined, the segment formed is parallel to the third side and equal to one- half the length of the third side.

Answers

The following answers were posted by visitors named Sindy.

Ok thanks. The problem is, I'm from Australia and we don't use those measurements. But I MIGHT be able to use other Australian measurements.

Okie i get Cp= 42178.8J/g delta C and for the octanol im using q= m*Cs*T q= 0.876*Cs*8.158 q= 7.1395g degreeC * Cs In your work i don't understand thisequation: [mass octanol x specific heat octanol x delta T] + [Cp x delta T] = 0

Okie I get 36913.6J/g* degree C but how do I change that into kJ/mol?

Benzoic is 26.38 and the temp rises 8.518

I did is again: Benzoic acid: q= m*Cs*T Cs = 4.217kJ/g°C q1 + q2 = 0 [m*Cs*T] + [26.38kJ] = 0 [.876g*Cs*8.518°C]+ [26.38kJ] = 0 7.462g°C * Cs = -26.38kJ Cs= -3.535kJ/g°C to get the molar enthalpy: -3.535kJ/g°C * 114g/mol= 403.03kJ/mol* °C

36913.6 J/g * 114g/mol= -4208150.4J/mol and to convert that to kJ= -4208150400 kJ/mol. the correct answer is -5116 kJ/mol

this is so confusing =(