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1. Quantitative analysis of a 5.00-g sample of a gaseous compound yielded the following results: 2.00 g sulfur and 3.00 g oxygen. What is the empirical formula of the compound?2. What is the molecular formula for butane if it has an empirical formula of C2H5 and each molecule has 10 hydrogen atoms?3. The percent composition of acetic acid is 39.99% C and 6.73% H. The remainder of the compound is oxygen. The molar mass of acetic acid is 60.06 g/mol. Calculate the molecular formula of acetic acid.4. What is the empirical formula of a compound that is 29.08% Na, 40.56% S, and 30.36% O?5. a) Calculate the percent composition of a compound that has 0.90 g of calcium and 1.60 g of chlorine.b) Determine the empirical formula for this compound.6. Determine the empirical formula of a compound that is 52.92% aluminum and 47.08% oxygen.
assuming a pressure of 1.00 atm and a temperature of 25 celcius calculate the volume of hydrogen that should form from
Calculate the average speed of a gas that has a molar mass of 2.08 × 10-2 kg /?mol at a temperature of 22°C. The value for the gas constant, R, is 8.314 J /?mol K.
For H3PO4, a tripotic acid, Ka1 = 7.1 × 10-3, Ka2 = 6.3 × 10-8, and Ka3 = 4.5 × 10-13. What is the pH of a solution which contains 0.200 mol of K2HPO4 and 0.300 mol of Na3PO4 per liter of solution?
A solution of vinegar is 4.78% by mass acetic acid in water. Assuming the density of vinegar is 1.00 g/ml, what is the molarity of acetic acid
10.0 mL of a 0.30 M sodium phosphate solution reacts with 20.0 mL of a 0.20 M lead(II) nitrate solution (assume no volume change).
a solution is prepared by dissolving 396 grams of sucrose in 624 grams of water. what is the vapor pressure of this solution at 30 degrees celsius.
The crystal structure of an element X can be described as follows: X atoms form a face-centred cubic lattice with an edge length of 356.7 pm. In addition, there are X atoms occupying every other tetrahedral site in the face-centred cubic lattice.
Determine the number of moles of oxygen that react completely with 8.0 moles of C2H6 based on the following balanced equation.
Which solution will have the larger change in its freezing point: a 0.75 molal solution with water as the solvent or a 0.75 molal solution with naphthalene as the solvent. Calculate delta T for water and delta T napthalene
describe the change in conductivity as the concentration of the NaCl solution was increased by the addition of NaCl drops
acetic acid has a Ka value of 1.8x10^-5. How many grams of NaC2H3O2 would have to be added to 100 ml of .1 M HC2H3O2 to prepare a buffer with a pH of 4.5?
A student adds an excess (more than she needs to react completely) of solid sodium hydrogen carbonate to a beaker containing exactly 675 mL of 0.220M coper(II)nitrate aqueous solution.
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