I need help answering these chemistry problems?

Posted on 2015-11-26 07:19:00 in Chemistry by KEN MARG

For which of the following equations is the enthalpy change at 25°C and 1 atm equal to ?H o f (HCOOH(l))?
a. CO2(g) + H2(g) --> HCOOH(l)
b. CO(g) + H2O(l) ---> HCOOH(l)
c. C(s) + 2H(g) + 2O(g) ---> HCOOH(l)
d. C(g) + 2H(g) + 2O(g) ----> HCOOH(l)
e. C(s) + H2(g) + O2(g) ---> HCOOH(l)

Consider two gas samples, one of H2(g) and one of N2(g). Both samples are the same volume (1.00L), the same pressure (785mm Hg), and the same temperature (25?C). Indicate whether each item would be greater in the H2 sample or the N2 sample, or whether the two samples would be equal. For each item, check the appropriate box.
a) have more molecules? b) have a greater density? c) have greater kinetic energy? d) have a greater root mean squared velocity?

When 75.0mL of 1.00M HCl reacts with 75.0mL of 1.00M NaOH in a calorimeter, the calorimeter absorbs 4.1 x 103 J. What is the value of ?H°rxn, the enthalpy change per mole of water produced for the reaction HCl(aq) + NaOH(aq) ? H2O(l) + NaCl(aq)?

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