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A mixture of composition of 70.0% methane (CH4) and 30 % ethane (C2H6) by mass is burned up in oxygen to produce carbon dioxide and water. The reactions that occur are CH4 + 2 O2 = CO2 + 2 H2O and 2 C2H6 + 7 O2 = 4 CO2 + 6 H2O. How many grams of oxygen are needed to react completely with 50.0 grams of the hydrocarbon mixture?
When a dilute solution of a weak base (Ka- 3.5*10^-9) is titrated with a 0.100 M solution of HCl at 25 C, the equilibrium constant for the titration reaction has this value:
How many grams of potassium chlorate decompose to form potassium chloride and 450. mL O2 at 128°C and 750. torr?
A gaseous mixture of O2 and N2 contains 39.8% nitrogen by mass. What is the partial pressure of oxygen in the mixture if the total pressure is 645 mmHg
If a saturated solution of NH4NO3 at 70 °C is cooled to 10 °C, how many grams of solute will separate if the quantity of the solvent is 94.0 g?
Which of the following equilibria would NOT be affected by pressure changes atconstant tempature. a.) CO(g) + 1/2O2(g) CO2(g) b.)CaCO3(s) CaO(s) + CO2(g)
It is often possible to change a hydrate into an anhydrous compound by heating it to drive off the water (dehydration).
Calculate the degree of unsaturation in the following formulas and draw a possible structure for each C8H8O C4H7Cl
Which of the following compounds will have the highest molar solubility in pure water. Answer A. PbSO4, Ksp = 1.82 × 10-8 B. MgCO3, Ksp = 6.82 × 10-6 C. AgI, Ksp = 8.51 × 10-17 D. PbS, Ksp = 9.04 × 10-29 E. FeS, Ksp = 3.72 × 10-19
The solution was boiled to remove CO2, following which the excess HClO4 was back-titrated with 10.12ml of dilute NaOH. In a separate experiment, it was established that 27.43 ml of HClO4 neutralized the NaOH in a 25ml portion. Calculate the molari..
Using electronegativity, predict in the order of decreasing polarity the following bonds: N-P, N-O, N-C, N-S, N-F. Predict how valence electrons would pair up in the AsO4-3 ion.
Suppose that after delivery several drops of the water cling to the inner wall of the pipette (because the pipette is dirty). How does this technique error affect the reported density of water?
Determine the molecular geometry, or shape, of ClO2 a. octahedral b. tetrahedral c. trigonal bipyramidal d. trigonal planar e. t-shaped f. bent
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