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A 72kg man stands on a spring scale in an elevator. Startingfrom rest, the elevator acsends, attaining its maximum speed of 1.2m/s in 0.80 s. The elevator travels with this constant speed for5.0 s, undergoes a uniform negative acceleration for 1.5 s, andthen comes to rest. Whatdoes the spring scale register (a)before the elevator starts to move? (b) during the first 0.80 s ofthe elevator's ascend? (c) while the elevator is traveling atconstant speed? (d) during the elevator's negativeacceleration?
Mg3N2(s) + 3 H2O(l)= 3 MgO(s) + 2 NH3(g) How many moles of Magnesium oxide are produced by the reaction of 3.82g of Magnesium nitride with 7.73g of water?
If you prepare a liter of 0.02 M acetic acid and 0.01 M sodium acetate, what will be the pH if the pKa of acetic acid is 4.76? b) If you add 1 ml of 5 M NaOH to the 1 liter above, what will be the new pH and the change in pH?
What is the final temperature of the water and pieces of metal?
What is the concentration of the HNO3 solution? Your response differs from the correct answer by more than 10%. Double check your calculations. M (b) How many moles of NaOH were in excess after the first addition?
The k1 is on top of the right pointing arow and k2 is below the left pointing arrow and the arrows are like they are in equilibrium. The k3 is above the lone arrow in the second reaction. In the find expression part the N02 is a subscript of P
A gas occupying a volume of 695 mL at a pressure of 0.970 atm is allowed to expand at constant temperature until its pressure reaches 0.541 atm. What is its final volume?
If an automobile is able to travel 246 on 10.6 of gasoline, what is the gas mileage in ?
A weak acid (HA) is found to ionize 17.8% when mixed at a concentration of 0.3 mol/L. What is the value of Ka for this acid?
The amount of lead in a aqueous sample is determined by atomic absorption spectrometry. Two standard solutions are prepared and used to make a calibration curve, and then the absorbance of the sample is measured.
Mass of mineral sample = 0.123 g The Na2SO4 in the sample is converted to insoluble BaSO4. The mass of BaSO4 is 0.177 g What is the mass percent of Na2SO4 in the mineral?
A mixture of 0.150 moles of C is reacted with 0.117 moles of O2 in a sealed, 10 L vessel at 500 K, producing a mixture of CO and CO2
Draw the Lewis Structure and make a rough three-dimensional sketch of each species.
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