Calculate the enthalpy change

Reference no: EM13162296

A calorimeter contains 29.0 mL of water at 13.0, ^{circ}C. When 2.40 g of rm X (a substance with a molar mass of 45.0 g/mol) is added, it dissolves via the reaction

rm X{(s)}+H_2O{(l)} rightarrow X{(aq)}
and the temperature of the solution increases to 30.0, ^{circ}C.

Calculate the enthalpy change, Delta H, for this reaction per mole of rm X.

Assume that the specific heat and density of the resulting solution are equal to those of water [4.18 rm J/(g cdot {^circ C}) and 1.00 rm g/mL] and that no heat is lost to the calorimeter itself, nor to the surroundings.

Reference no: EM13162296

Questions Cloud

What are the active ingredients : What are the active ingredients & determine what possible tests to perform to identify each active ingredient. (what is the expected result?) - can't use melting points, boiling points, burning of solids, benedict's solution and tasting.

Explain what is the net ionic equation for the reaction : Calculate the heat evolved when 75.0 mL of a 2.00M HCl solution reacts with 37.5 mL of a 4.00M NaOH solution if the temperature rises from 20.0 degree C to 37.9 degree

What factors will determine the best number of firms : Why should this employee probably choose to tell only some of the other firms rather than all of them and what factors will determine the best number of firms to sell the secret to?

What is the ph of the buffer : A buffer solution was prepared by adding 4.95 g of sodium acetate, NaCH3CO2, to 2.50 x 10^2 mL of 0.150 M acetic acid, CH3CO2H. What is the pH of the buffer?

Calculate the enthalpy change : Assume that the specific heat and density of the resulting solution are equal to those of water [4.18 rm J/(g cdot {^circ C}) and 1.00 rm g/mL] and that no heat is lost to the calorimeter itself, nor to the surroundings.

Find the velocity of an electron emitted by a metal : Find the velocity of an electron emitted by a metal whose threshold frequency is 2.15×1014 {rm s^{-1}} when it is exposed to visible light of wavelength 4.76×10-7 {rm m}.

Explain sample of aspirin prepared in the laboratory : Explain 3-A 0.421 g sample of aspirin prepared in the laboratory is dissolved in 95% ethanol, diluted with water, and titrated to a phenolphthalein endpoint with 17.3 mL of 0.114 M NaOH. What is the percent purity of aspirin in the sample?

Use the chemical formula to determine the number of moles : First determine the number of moles of rm Na^+ using the given molarity and volume. Next, use the chemical formula to determine the number of moles of rm Na_3PO_4 needed. Finally, convert moles to grams using the molecular weight of the compound.

Calculate the triangle h degree f for calcium cyanamide : Calculate the Triangle H degree f for calcium cyanamide.

User Account

All Pages