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A sample of 0.600 moles of a metal M reacts completes with excess of fluorine to form 46.8g of Mg2. How many moles of F are present in the sample of MF2 that forms?
A wire carries a current of 9.8 A in a direction that make an angle of 32.4? with the direction of the magnetic field of strength 0.262 T. Find the magnetic force on a 5.4 m length of the wire.
Calculate the average speed of an oxygen gas molecule,o2 , at 25.0.
Two air carts of mass = 0.80 and = 0.44 are placed on a frictionless track. Cart 1 is at rest initially, and has a spring bumper with a force constant of 690 . Cart 2 has a flat metal surface for a
How much work is done by the system when 2.00 moles of O2 expand from a volume of 3.00 liters to a volume of 3.5 liters against a constant external pressure of 0.0100atm? Answer in units of J.
Find maximum and minimum frequencies of sound detected by the detector, if vibration frequency of each block is 3.5Hz.(sound velocity is 330m/s).
A cook wants to heat 2.00 of water from 35.0 to 100.0 .If he uses the combustion of natural gas (which is exothermic) to heat the water, how much natural gas will he need to burn? Natural gas produ
Consider a local concentration of 106 units per cm3 which drops by 10% over a distance of 1 cm. Then the gradient is -105 [units cm-4]. Assume the diffusivity is 103 [cm2/s]. Calculate the flux.
A chemist wanted to determine the concentration of a solution of lactic acid, HC3H5O3. She found that the pH of the solution was 2.59. What was the concentration of the solution?
From the damage sustained, police estimate that the car was moving at 18 at the time of the collision. They also measure skid marks 34 long. How fast was the motorist going when the brakes were firs
Balance the following molecular equations for these reactions. Write the ionic equation for the reactions. Write the net ionic equation for the reactions.
Chlorophyll found in plant cells and essential to the process of photosyntheses, contains 2.72% Mg by mass. Assuming one magnesium atom per chlorophyll molecule, calculate the molecular mass of chl
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?