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A calorimeter contains 27.0 g of water at 11.0 C. When 2.10 g of X (a substance with a molar mass of 80.0 g) is added, it dissolves via the reactionX (s) +H2O (l) -> X (aq)
and the temperature of the solution increases to 25.0 C.Calculate the enthalpy change, , for this reaction per mole of X.
Assume that the specific heat and density of the resulting solution are equal to those of water [4.18 J/ g.C and 1.00 g/mL ] and that no heat is lost to the calorimeter itself, nor to the surroundings.
C5H12, 10.0 g hexane, C6H14 and 10.0 g benzene, C6H6. What is the mole fraction of hexane?
What is the sum of the simplest whole number ratio coefficients in the balanced chemical equation for complete combustion of C3H8.
On a cold dry morning after a frost, the temperature was -5C and the partial pressure of water in the atmosphere fell to .30 kPa. Will the frost sublime? What partial pressure of water would ensure that the frost remained?
A 4.78 g sample of aluminum completely reacts with oxygen to form 6.67 grams of aluminum oxide. Use this date to calculate the mass percent composition of aluminum in aluminum oxide.
what is the band gap energy in kilojoules per mole if bule diamonds absorb orange light with a wavelength of 675nm
What is the emf of this cell when [Ni2+]= 3.00 M and [Zn2+]= 0.100 M ? What is the emf of the cell when [Ni2+]= 0.190 and [Zn2+]= 0.820?
The quantity of antimony in an ore can be determined by an oxidation-reduction titration with an oxidizing agent. The ore is dissolved in hot, concentrated acid and passed over a reducing agent so that all the antimony is in the form Sb3 (aq).
If 10g of na2s2o3 are reacted with 10g of agbr, what would be the maximum yield of nabr and which is the limiting reagent, if any?
Using the ionic radii Li 76pm, F 133pm, K 138pm, Br 196pm, show that LiF and KBr are consistent with the rule of thumb that the NaCl structure occurs for radius ratios between .414:1 and .732:1 and calculate densities for LiF and KBr.
Rank the following hydrogen atom transitions in order of increasing energy of light produced ( from lowest energy light produced to highest energy light produced).
circle the correct choices to indicate how many electrons each element must gain or lose to form an octet
The tmeperature s increased to 1200 K, so that all CaC204 decomposes to form CaO according to the reactions, The density of the gas mixture at 1200K was 0.70501 g/L. What was the mass of the calcium oxalate initially placed in the vessl?
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