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A student completed the experiment but found that the total amount of material recovered weighed more than the the original sample. What is most likely source of error and how it may corrected? B) A student found that the mass of the napthalene collected was less than the mass determined by difference. What would account for the smaller amount of napthalene collected? C.) Mothballs in a closet gradually disappear over time. What happens to this material? D.) In 100g. of sweet peas, there are 14.5g carbohydrates, 5.7g sugars, 5.1g dietary fiber, 5.4g protein and 0.4g fat. Calculate the percent composition of these components.
A 100.0-mL buffer solution is 0.175M in HCIO and 0.150M in NaCIO .What is the pH after addition of 150.0mL of HBr?
Chlorine dioxide, ClO2, is a reddish yellow gas used in bleaching paper pulp. The average speed of a ClO2 molecule at 25 degrees Celsius is 306 m/s. What is the kinetic energy of a ClO2 molecule moving at this speed?
How many grams of CaCl2 would be required to produce a 3.5 M (molar) solution with a volume of 2.0 L.
The solubility of silver sulfate in water is 0.223% (w/v) at 35°C. Calculate the solubility product of this salt at this temperature
In the first 12.0 s of the reaction, 1.8×10-2 moles of O2 is produced in a reaction vessel with a volume of 0.260 L. What is the average rate of the reaction over this time interval?
Write and equation for the reaction of Ba+ with CrO4 2-. Using the eqution you have written, explain how the addition of HCl shifts the equilibrium of the reaction
When 7 mL of a solution containing 3 M KNO3 is diluted to 21mL, a dilute solution is formed. What is the NO3- concentration in 10mL of the dilute solution?
How many kilowatt-hours of energy are necessary to heat the air in the house from 5degree C to 25degree C
The pressure of a gas is 817 torr at 55°C. The quantity of the gas is fixed and the volume remains constant as the pressure is adjusted to 102 torr. What is the resulting temperature of the gas?
How do you redraw methane to show the tetrahedral character of carbon in methane by drawing methane using solid wedges and dashed wedges?
write the net ionic equations for the reactions involved in the testing of each of the following anions
when 0.500 l of a 1.00 m solution of Pb( NO3) 2 is mixed with 0.500 l of a 1.00 m solution of Kl how many grams of lead(II) iodide are formed
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