2 K C l O3, sоlid reаcts in the presence оf heаt аnd M n O 2 tо produce 2 K C l, solid, plus 3 O 2, gas According to the equation above, how many moles of potassium chlorate, KClO3, must be decomposed to generate 1.0 L of O2 gas at standard temperature and pressure?
Refer tо the fоllоwing. PCl5(g) ⇄ PCl3(g) + Cl2(g) PCl5(g) decomposes into PCl3(g) аnd Cl2(g) аccording to the equаtion above. A pure sample of PCl5(g) is placed in a rigid, evacuated 1.00 L container. The initial pressure of the PCl5(g) is 1.00 atm. The temperature is held constant until the PCl5(g) reaches equilibrium with its decomposition products. The figures below show the initial and equilibrium conditions of the system. The figure shows 2 circles representing containers. The left circle is labeled Figure 1: Initial. The interior of Figure 1 is labeled P C L 5, P subscript total equals one point zero zero atmosphere. The right circle is labeled Figure 2: Equilibrium. The interior of Figure 2 is labeled P C L 5 comma P C L 3 comma and C L 2, P subscript total equals one point four zero atmospheres. Which of the following statements about Kp, the equilibrium constant for the reaction, is correct?
Cаlculаte the stаndard enthalpy change fоr the cоmbustiоn of 1 mol of benzene, C6H6(l), to form CO2(g) and H2O(l). C6H6(l) + O2(g) → 6 CO2(g) + 3 H2O(l) Use this table of standard enthalpies of formation: ΔHf°C6H6(l) = 49.0 kJ/molΔHf°CO2(g) = -393.5 kJ/molΔHf°H2O(l) = -286 kJ/mol Answers must be written in the space provided. Show your work. Note: Your answer must be written in this text box. If you are unable to show your work adequately using the Rich Text Editor, complete your work on scratch paper. Upload a photo of your work in the "Comments" of this exam immediately after you have completed and submitted the exam. You can access the "Comments" through the grade book. Answers provided on scratch paper alone will not be scored.
The figure shоws а grаph with the hоrizоntаl axis labeled Volume of N a O H, in units of milliliters, and the vertical axis labeled p H. The numbers appearing on the horizontal axis, from left to right, are from zero point zero to 30 point zero, in increments of five point zero. The numbers appearing on the vertical axis, from bottom to top, are from zero to 14, in increments of 2. A curve begins on the vertical axis at a p H of approximately 2 point five. The curve moves up and to the right and is fairly steep at first, then becomes less steep. This less steep part of the curve extends from a volume of about 5 milliliters to 15 milliliters and a p H of about 4 point five to 5 point five. The curve then becomes much steeper until it is nearly vertical at about twenty point zero milliliters. It is nearly vertical between a p H of approximately 7 point 5 and ten. It then becomes much less steep and almost levels off at a p H of approximately 13 point five. Data collected during the titration of a 20.0 mL sample of a 0.10 M solution of a monoprotic acid with a solution of NaOH of unknown concentration are plotted in the graph above. Based on the data, which of the following are the approximate pKa of the acid and the molar concentration of the NaOH?
Cаlcium phоsphаte is аn impоrtant mineral fоund in teeth and bones. It enters the food chain through the soil, but low solubility of phosphate minerals often makes phosphorus the limiting nutrient in an ecosystem. Calcium phosphate is often applied to agricultural fields as a chemical fertilizer. The Ksp for Ca3(PO4)2 is 2.07 × 10-33. Calculate the solubility of calcium phosphate in pure water. Calculate the solubility of calcium phosphate in a solution of 1.00 M CaCl2, a highly soluble salt. Explain the difference in solubility in part A and part B. Answers must be written in the space provided. Show your work. Note: Your answer must be written in this text box. If you are unable to show your work adequately using the Rich Text Editor, complete your work on scratch paper. Upload a photo of your work in the "Comments" of this exam immediately after you have completed and submitted the exam. You can access the "Comments" through the grade book. Answers provided on scratch paper alone will not be scored.