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| From:  Albert1145 (Original Message) | Sent: 8/18/2008 2:23 PM |
Hi Steve,
I'm so sorry for the trouble. I doing online pretest, but just can't get these 4 questions out! Could you show me how you convert each values and which times which so I can compare with mine? I have so many versions of answers for each question and I don't know which one is right?
Q2:
The heat of neutralisation of HCl by NaOH is given below:
HCl(aq) + NaOH(aq) -> NaCl(aq) + H2O(l) Δ H= -56.2 kJ/mol
What is the value of qp (in kJ) when 125 mL of 1.750 M HCl is mixed with 184.5 mL of 0.667 M NaOH?
Q3:
0.1326 g of aluminium was completely combusted in a constant-volume bomb calorimeter having a heat capacity of 1410 J/oC.
The bomb calorimeter was surrounded by 800 g of water. The temperature of the bomb and the water increased by 1.726 oC.
Calculate the heat of combustion of aluminium in J/mol. Which of the choices below is the correct equation for the calculation? The specific heat of water is 4.18 J deg-1 g-1.
A. [1410+(800)*(4.18)]*(1.726)*(26.96)/(0.1326)
B. (800)*(4.18)*(1.726)/(26.98)
C. (1410)*(1.726)/(0.1326)
D. [1410+(800)*(4.18)}*(1.726)/(26.96)
Q12
A helium balloon had a volume of 22.0 L at sea level where the atmospheric pressure is 0.951 atm. When the balloon rose to a height at which the atmospheric pressure is 73.3 kPa, the balloon burst. What was the volume of the balloon (in L) before it burst?
Q7
Two gas flasks, A and B, are kept at the same temperature and pressure. Flask A has a volume of 10 L and contains 10 g of methane gas, CH4. Flask B has a volume of 5.6 L and contains carbon dioxide gas. Calculate the mass of carbon dioxide (in g) in flask B.
Thank you very much
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·Steve· |
8/18/2008 10:16 PM |
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