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An unknown compound contains only C, H, and O. Combustion of 4.40 g of this compound produced 8.79 g of CO2 and 3.60 g of H2O. What is the empirical formula of the unknown compound. CHO
What is the empirical formula of a compound composed of 3.25% hydrogen (H), 19.36% carbon (C), and 77.39% oxygen (O) by mass. HCO
61.0 mL of a 1.70 M solution is diluted to a volume of 268 mL. A 134-mL portion of that solution is diluted using 119 mL of water. What is the final concentration
When the reaction 2 H2S g ~ PCl3 + Cl2 is carried out at 1065 degrees celcius, Kp = 0.012. Starting with pure H2S at 1065degrees, what must the initial pressure of H2S be if the equilbrated mixture
A two-slit pattern is viewed on a screen 1.05 m from the slits. If the two third-order minima are 25.0 cm apart, what is the width of the central bright fringe
Calculate the molarity of the following solutions. a) 0.600 mol of Na2S in 1.40 L of solution. b) 20.1 g of MgS in 851 mL of solution.
CaCO3(s)+2HCl(aq) -> CaCl2(aq) +H2O(l) +CO2(g) How many grams of calcium chloride will be produced when 27.0 g of calcium carbonate are combined with 12.0 g of hydrochloric acid. Which reactant i
The right-side rearview mirror of Mike's car says that objects in the mirror are closer than they appear. What is the focal length of the rearview mirror
The original molarity of a solution of formic acid (HCOOH) with a Ka= 1.7*10^-4 whose pH is 4.52 at equilibrium is: A. 8.52 *10^-9 B. 2.24*10^-4 C. 6.78*10^-3 D. 3.54*10^-5 E. 5.32*10^-7
A magnifier used for reading small print is shaped like a hemisphere 2.0 cm in radius, placed on top of a cylinder of the same radius, Where does the image of the print appear to be
A pair of hedge trimmers are 45 cm long from the pivot to the end of the handles. If the person applies of a force of 15 N on each handle, how much force is applied to the branch
Epsom salt is a hydrate with a formula MgSO4*X H2O, where x indicates the number of moles of H2O per mole of MgSO4, After a 1.687 g sample of the hydrate is heated, 0.824 of MgSO4 remains. How many
What is the maximum mass of S8 that can be produced by combining 80.0g of each reactant? 8SO2+16H2S -> 3S8 + 16H2O
A light beam is incident on heavy flint glass (n=1.65) at the polarizing angle. Angle of refraction is 31.22 degrees. determine the change in the intensity
Small quantities of oxygen can be prepared in the lab by heating potassium chlorate, KCIO3(s) 2KClO3 -> 2KCl+3O2 Calculate how many grams of O2(g) can be produced from heating 59.4g of KClO3(s)
The solubility product Ksp for silver iodide is 1.5X10%u221216 at 298K. calculate the osmotic pressure of a saturated aqueous solution of silver iodide at this temp. you may assume that the solution
Which salt would you expect to dissolve readily in acidic solution. calcium phosphate, Ca3(PO4)2 calcium sulfate, CaSO4 Calculate K for the reaction of H3O+ with the PO43- anion. Calculate K for the
If 67.0 mL of 0.119 mol/L NaOH(aq) and 35.0 mL of 0.193 mol/L HA(aq) are mixed, then what is [HA] at equilibrium? Assume that HA is a weak monoprotic acid with pKa=6.23 at 25oC.
A rod of length l and uniform mass m is hinged at its lower end while it was held at rest in a vertical position. What is the angular acceleration of the rod during the fall for a given theta
A cube of copper with each edge having the dimension 12.7 mm, is put in a vise and squeezed by a force of 215 N exerted by either side of the vise. What is the stress in the copper cube
Calculate the pH at the points in the titration of 40.00 mL of 0.425 M NH3 for the reaction below. NH3(aq) + HNO3? NH4+(aq) + NO3?(aq) For NH3, Kb = 1.8x10-5. Enter your answer with 2 decimal places
A stunt driver wants to make his car jump over 8 cars parked side by side below a horizontal ramp as seen in the figure below. With what minimum speed must he drive off the horizontal ramp to just bar
What is the pH at the equivalence point when when 40.0 mL of 0.183 mol/L HC7H5O2(aq) is titrated with 0.131 mol/L NaOH(aq)? Assume the temperature is 25oC
For a solution that is 0.282 M NH3 and 0.117 M NH4NO3, calculate the following. For NH3, Kb is 1.8x10-5. Enter [OH?] and [H3O+] with two significant digits. Enter scientific notation as 1.23E4.
What is the final pH of the solution when 15.0 mL of 0.121 mol/L NaOH(aq) and 35.0 mL of 0.181 mol/L HNO2(aq) are mixed? Assume the temperature is 25oC.