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Cars were timed by police radar as they passed in both directions below a bridge. Their velocities (kilometres per hour, numbers of cars in parentheses) to the east and west were as follows: 80 E (40), 85 E (62), 90 E (53), 95 E (12), 100 E (2); 80 W (38), 85 W (59), 90 W (50), 95 W (10), 100 W (2). What are (a) the mean velocity, (b) the mean speed, (c) the root mean square speed?
A powder contains FeSO4·7H2O (molar mass = 278.01 g/mol) among other components. A 3.585-g sample of the powder was dissolved in HNO3 and heated to convert all iron to Fe3
How many moles of hydrogen gas are produced when 0.066 mole of sodium is completely reacted?
a student titrates 50.0ml of apple juice and reports the following in the titration to the phenolphthalein end point with 0.1011 M NaOH.
25g of a hydrocarbon undergoes complete combustion leading to the formation of 77 g of CO2. What is the % of carbon in the hydrocarbon?
Show your calculations for the pH when 0.00 mL, 4.00 mL, 6.00 mL, 12.00 mL (equivalence point), and 16.00 mL of 0.10 M HCl have been aded to an initial
Calculate the molar solubility of strontium chromate in water at 298 K if Ksp = 3.6 * 10-5.
if the total amount of energy emitted by a carbon sample is 1.98x10^5 J, determine the number of carbon atoms present in the sample, assuming that each atom emits one photon
Hydrogen gas was collected over water in a eudiometer at 26 oC when the atmospheric pressure was 756 mm Hg. What was the pressure of the hydrogen gas?
A sample of chlorine, which has an average atomic mass of 35.86, consists of two isotopes with mass of 35 and 37. What is the percent (to 0.1%) abundance of the 37 isotope?
For an oxidation and reduction reaction, indicate what is oxidized and what is reduced in the following reaction.
Calculate the theoretical yield of C2H5Cl when 138 g of C2H6 reacts with 244 g of Cl2, assuming that C2H6 and Cl2 react only to form C2H5Cl and HCl.
Determine the standard reaction enthalpy for the partial combustion of methane to carbon monoxide.
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