Open Question: Finding the change in enthalpy?
?Hsoln
?Hcomb
?Hfus
?Hf
?Hvap
I've never done a problem like this and do not understand.
Open Question: Does the R group on an amino acid change at all when it goes from low PH -ph of pI - high ph?
Dereck Pil Member since:March 14, 2011Total points:92 (Level 1)I know the basic portion of the amino acid gains and loses electrons (H) in the process but does any thing happen to the R group that makes it that particular amino acid.Answer Question
by Abbie Abbott Member since:April 22, 2011Total points:102 (Level 1)I found this for you.http://u96.info/366837/amino-acidshttp://u96.info/366837/amino-acids
Open Question: Calculate the standard state change in entropy for the following reaction using third law entropies: Li+ (aq)?
Open Question: physics change in variable questions?
(Linear expansion of steel is a = 12 x 10-6 /C°)
2. A pan full of water has a volume of 3.8 liters at 2 °C is heated to 98 °C without boiling, what is the change in volume of the water? (Volume expansion of water is ß = 207 x 10-6 /C°)
3. A square hole is cut out of a sheet of aluminum, the hole has a length and width of 10.000 cm (A = 100.000 cm2) when it is starts out, the sheet is cooled down to room temperature (20 °C) and the new area is 97.8044 cm2) , what was the original temperature of the aluminum sheet? (aAl = 23 x 10-6/°C)
thank you in advance
Open Question: a 15.4 g ice cube is placed into 316 g of water. calculate the temperature change in the water upon complete?
5150 J = (316 g) (?t) (4.184 J/g C)
?t = 3.90 C
Open Question: Additional mathematics: Rate Of Change (5 Point!!) with star!?
Open Question: what genetic mechanism may have been responsible for this change in sequence?
Open Question: How can I change a logarithm of base 10 to base 5?
log512 = log 12/log 5
Also note 12 = 4•3 = 2²•3, so log 12 = log 2²•3 = 2•log 2 + log 3 = 2a + b
Further note that 5 = 10/2, so log 5 = log (10/2) = log 10 – log 2 = 1 – log 2 = 1 – a
Thus substituting from the above, log512 = log 12/log 5 = (2a + b)/(1–a)
Open Question: Phase change down a transmission line?
Open Question: How do I calculate the enthalpy change of formation of MgCO3?
From this I was able to work out the enthalpy change per mole of magnesium. The second part of the question is the bit I'm stuck on...
"In a similar experiment, solid magnesium carbonate reacted with an excess of dilute hydrochloric acid and the enthalpy change was found to be -90kJ mol^-1 of magnesium carbonate.
The enthalpy change of the formation of H2O is -285kJ mol^-1 and of CO2 is -393kJ mol^-1. Use this data and your result from above to calculate the enthalpy change of formation of MgCO3."
Can you please talk me through how to do it?
