Determine the pH of each solution.a. 0.20 M KCHO2 b. 0.20 M CH3NH3I c. 0.20 M KI

A series of reactions carried out in separate containers at a constant volume and a constant pressure. For each reaction, what is the ratio of the final temperature to the intial temperature? (enter answers as simplified ratios) 1) 2CH4(g) + 2O2(g) --> 2CO(g) + 4H2O(g) 2) S(g) + H2(g) --> H2S(g) 3) C2H4(g) + H2(g) --> C2H6(g) 4) 2C2H2(g) + 5O2(g) --> 4CO2(g) + 2H2O(g)

Urea is to be crystallized from an aqueous solution that is 90% saturated at 100oC. If 90% of the urea is to be crystallized in the anhydrous form and the final solution temperature is to be 30oC, what fraction of the water must be evaporated?

4. Adsorption Isotherm Curve: The low pressure (beginning region) of an adsorption isotherm curve can be approximated with a linear equation of the form: X₁* = K x P₁. The data in the table below provides laboratory measured values of the partial pressure of an adsorbate P¡ versus the mass fraction of adsorbate on the adsorbent X;*. Determine the value of K for the equation above using the data in the table, and also provide the r-squared value of this linear equation fit. Recommend you use the linear regression function in EXCEL to determine these answers. X* (gr adsorbate/gr PCC14 (mm Hg) adsorbent) 0 0 2 0.084 3.5 0.15 5 0.27 7 0.38 10 0.525 Value of K in equation above r-squared value from linear equation fit