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A child playing in a swimming pool realizes that it is easy to push a small inflated ball under the surface of the water while a large ball requires a lot of force. The child happens to have a styrofoam ball (this way the shape of the ball will not distort when it is forced under the surface) which is being forced under the surface of the water. If the child needs to supply 635 N to totally submerge the ball, calculate the diameter of the ball. The density of water is ?w = 1.000 g/cm3, the density of styrofoam is ?foam = 0.0950 g/cm3 and the acceleration due to gravity is g = 9.81 m/s2.
A sample of air contains 78.08 % N2, 20.94% O2, 0.05 %CO2, 0.93% Ar by volume. a) How many molecules of each gas present in 1.00 L sample at 25 C and 1.00 atm. b)What is the partial pressure of each gas?
Determine the molecular formula of the compound with molar mass 336.5g mol-1 and empirical formula C 5 H 8 O?
What is osmium's molar capacity if the two substances reach thermal equilibrium at 100 degrees Celsius? Osmium, the densest known metal, has a density
0.375 kg of water are in a well insulated container at 21.3 c. After 4.184kj of heat are added to the water, what is the final water temperature ?
Calculate the root mean square velocities of Cl2(g) and O2(g) molecules at 263 K and 505 K.
how much energy is required to warm 100g of H2O from 20 degrees celcius to 80 degrees celcius if it is initially in a 140g glass flask? the specific heat of water is 4.18 J/g degree celcius.
How many grams of water are needed to react with 78.0g CaCN2? How many grams of NH3 are produced from 5.19g CaCN2?
What is the theoretical yield of aluminum oxide if 1.60 mol of aluminum metal is exposed to 1.50 mol of oxygen?
for a certain change the value of U is -2.37 kJ. During the change, the system absorbs 650 joules. how much work did the system do.
Assume that this rate remains constant for a short period of time What is A 5.00min after the reaction is started? At what time after the reaction is started will A= 0.565M?
Calculate the wavelength, in naniometers, of the spectral line produced when an electron in a hydrogen atom undergoes
How many molecules of HCCH react with 143 molecules of oxygen to produce carbon dioxide and water?
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