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Magnesium hydroxide is 54.87% oxygen by mass. How much oxygen is in 153 g of the compound? Answer in units of g
A 5000 lb wrecking ball hangs from a 40 ft cable of density 10 lb/ft attached to a crane. Calculate the work done if the crane lifts the ball from ground level to 40 feet in the air by drawing in th
What mass of aluminum chloride is present after 74.7 g of aluminum nitrate and 56.8 g ammonium chloride have reacted completely?
The energy change H associated with the reaction NBr3(g) + 3H2O(g) ! 3HOBr(g) + NH3(g) is +81 kJ/mol rxn. These bond energy values might be useful: O-H 459 kJ/mol; N-H 386 kJ/mol; O-Br 201 kJ/mol. w
Imagine your homework assignment involves identifying an unknown pure substance. The valence electrons of the substance's atoms feel an effective nuclear charge of +4. If the unknown substance has
A bullet of mass 10 g is fired with an initial speed of 281 m/s into a wooden block The bullet becomes lodged in the block, and the two slide together on the floor for a distance of 1.2 m before com
A calorimeter contains 23.0 of water at 11.5. When 1.40 of (a substance with a molar mass of 62.0 ) is added, it dissolves via the reaction and the temperature of the solution increases to 30.0.
Which are the spectator ions from the following complete ionic equation:
A 800-N crate is being pushed across a level floor at a constant speed by a force vector F of 310 N at an angle of 20.0° below the horizontal, as shown in the figure below. What is the coefficie
A 5.2 g bullet leaves the muzzle of a rifle with a speed of 308 m/s. What force (assumed constant) is exerted on the bullet while it is traveling down the 0.75 m long barrel of the rifle?
what are the (a) magnitude and (b) direction of the displacement, the (c) magnitude and (d) direction of the average velocity, and the (e) magnitude and (f) direction of the average acceleration? (G
The density of Hexane is 0.659 g/mL. What is the mass of hexane in 25.9 mL?
Express your answer in condensed form in order of increasing orbital energy as a string without blank space between orbitals.
if 56 ml of HSiCl3 (d=1.34 g/mL) is isolated when 15.0L of HCl at atm and 35 degrees celciusis used, what is the percent yield of HSiCl3?
A balloon filled with helium has a volume of 2.41 L on a warm day at 311 K. It is brought into an air-conditioned room where the temperature is 295 K. What is its new volume?
125 mL of H2O is initially at room temperature 22.0 degrees C. A chilled steel rod at 2.0 degrees C is placed in the water. If the final temperature of the system is 21.5 degrees C, what is the mass
Two stationary positive point charges, charge 1 of magnitude 3.50 nC and charge 2 of magnitude 2.00 nC, are separated by a distance of 48.0 cm. An electron is released from rest at the point midway
A 69.0 kg person, standing on a diving board, dives straight down into the water. Just before striking the water, her speed is 5.20 m/s. At a time of 1.65 s after she enters the water, her speed is
What is the maximum speed of the electron? What is the amplitude of the electron's position?
Take the mass of the sun to be = 1.99×1030 , the gravitational constant to be = 6.67×10-11 , and the acceleration due to gravity at the earth's surface to be = 9.810 .
If the loop is placed in a uniform magnetic field of magnitude 0.400 T, what is the maximum torque that can act on it? The resistivity of copper is 1.7 10-8 · m.
Your roommate is working on his bicycle and has the bike upside down. He spins the 62.0 -diameter wheel, and you notice that a pebble stuck in the tread goes by three times every second. What is the
If the coefficient of friction between road and tires on a rainy day is 0.100, what is the minimum distance in which the car will stop?
A car engine is initially rotating at 185 rad/s. It is then turned off and takes 2.40 s to come to a complete stop. What is the angular acceleration of the engine? Assume acceleration is constant.