don't understand

Explain why a 1.00 molal solution of AlCl3 in water has a lower freezing temperature than a 1.00 molal solution of NaCl in water

don't understand

The DH of combustion of CH4 is -882kJ/mol.How many grams of water, which has a specific heat of 4.184 J/g-oC can be heated from 30oC to 95oC by the heat produced in the combustion of 2.25 mol of CH4?

don't understand

Using the table of bond determine the DH for the reaction: 2H--F(g) H--H(g)+ F--F(g)

multiple choice

Out of 250 questions, I am unsure of the following: 1.For a given substance that exhibits liquid-crystalline properties, the transition from solid to liquid-crystal state occurs: a.over a range of temperatures that includes the melting point of the soild. b. at a well defined temperture above the melting point of the solid. ...continues

help

Which, if any, of the following equations is or are correctly balanced? NH4NO3 N2 + O2 + H2O 3Cu + 8HNO3 3Cu(NO3)2 + 2NO + 4H2O 6CO2 + 6H2O C6H12O6 + 6O2 NaOH + Cl2 NaOCl + NaCl + H2O

help

Determine the empirical formula of the compound that is 21.96% S and 78.04% F by weight.

1 nitrogen dioxide

What happens to nitrogen dioxide, NO2, in sun light? Write the reaction equation for this process. Estimat the value of Kp for this reaction at 25 degrees C? Show all work and steps to the problem. If you are TA #103897 do not answer. Thanks

2 Change in S

Calculate the change in S for the reaction SO2(g)+ NO2(g) -> SO3(g) + NO(g). SO2 248.5 SO3 256.2 NO 210.6 NO2 240.5 Show all work and steps to the problem. If you are TA #103897 do not answer. Thanks

3 rate of constant

The rate constant for the reaction Cl+ Cl3CH-> HCl + CCl3 is 5.8E+7Mto the negative 1 s to the negative 1 at 25 degrees C and has an activation energy of 11.0KJoule/mol. Calculate the rate constant for this reaction in the lower stratosphere where the temperature is -57 degrees C. Show all work and steps to the problem. ...continues

4 element oxygen

The element oxygen was prepared by Joseph Priestley in 1774 by heating mercury(11)oxide: HgO(s)->Hg(l) + (1/2)O2(g) delta H = 90.84 KiloJoule/mol S(Hg)=76.02 J/K x mol S(o2)=205.0 J/K x mol s(HgO) =70.29 J/k x mol Estimate the temperature at which this reaction will become spontaneous under standard state conditions. ...continues