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A 39.0-kg boy, riding a 2.60-kg skateboard at a velocity of 5.70 m/s across a level sidewalk, jumps forward to leap over a wall. Just after leaving contact with the board, the boy's velocity relative to the sidewalk is 6.00 m/s, 7.30° above the horizontal. Ignore any friction between the skateboard and the sidewalk. What is the skateboard's velocity relative to the sidewalk at this instant? Be sure to include the correct algebraic sign with your answer.
0.02 grams of AgNO3 is dissolved in 1.0 L water. What is its concentration as parts per million
A total of 2.00 mol of a compound is allowed to react in a foam coffee cup that contains 172 g of water. The reaction caused the temperature of the water to rise from 21.0 to 24.7 C. What is the enthalpy of this reaction
A solution of 2.50 grams of a compound having the empirical formula c6h5p in 25.0 grams of benzene in observed to freeze at 4.3 degree celcius. calculate the molar mass of the solute and its molecular formula.
Compute the molar concentrations of these gases under conditions typical of (a) the mid-latitude troposphere (10°C and 1.0 atm) and (b) the Antarctic stratosphere (200 K and 0.050 atm).
Calculate the freezing point and boiling point of a solution containing 12.4 g of naphthalene (C10H8) in 103.0 mL of benzene.
Calculate the hydrogen ion concentration in a solution of fruit juice having a pH of 4.25. A) 1.0 × 10-14 M D) 2.5 × 10-4 M B) 5.6 × 10-5 M E) 5.6 × 10-4 M C) 4.0 × 10-25 M
how many grams of lead (II) chloride is produced when 13.87 g lead (II) nitrate combines with hydrochloric acid to produce lead (II) chloride and nitric acid?
Consider the following reaction: A(g)= B(g)+C(g) Find the equilibrium concentrations of A, B, and C for each of the following different values of Kc. Assume that the initial concentration of A in each case is 1.0 M
HxCyOz + NaOH --> xH2O + NaxCyOz If 27.33ml of 0.0973M NaOH were used to titrate 0.328g of pure unknown carboxylic acid, determine the number of reactive H in a single molecule of the carboxylic acid.
What volume of ammonia could be made from the reaction of 2.5 liters of nitrogen (N2) and 8.5 liters of hydrogen (H2) at STP?
What is the rate of reaction when the initial concentrations of NO and O2 are 0.030 M and 0.025 M, respectively? 2 NO(g) + O2(g) --> 2 NO2(g)
the total quantity of coal burned in canada and the united states in a year is approximately 450 x 106 t. the average
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