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Assuming that a neutron star has the same density as a neutron (4.0 x 10^14 g/cm3), calculate the mass (in kg) of a small piece of a neutron star the size of a spherical pebble with a radius of 0.20 mm.
silicon has three naturally occurring isotopes. 28si mass 27.976927 29si mass 28.976495 30si mass 29.973770 and 3.10
If 112 grams of calcium oxide were mixed with 224 grams of ammonium chloride, what maximum mass of ammonia could be produced?
a sample of oxygen that occupies 2.5 times 10-6 ml at 508 mm hg is subjected to a pressure of 1.2 atm. what will the
What is the molecular formula of a gas that has a density of 1.88 g/L at STP? this is not the actual numbers but it would be nice to know how to do this.
a gas has a volume of 50.0 cm3 at a temperature of -73acircdegc. what volume would the gas occupy at a temperature of
How many kJ of heat are required to produce 13.7g NO2, by 2NO2+ O2 --> 2NO2. the heat of reaction is 113.04
what is the chemical formula of a gas if it has a pressure of 680 torr and a density of 1.60 g/L at 27 degrees C.
Write the net ionic equation for the reaction that occurs when an aqueous solution of hydrochloric acid reacts with an aqueous solution of ammonia.and find delta H
Correlate the molar mass, molecular size, and bond polarity of these three gases with the molar volume of a perfect gas. O2, Co2, and H2
What are the approximate bond angles at the carbon atom of all alcohols except phenols
The equilibrium constant, Kp, for the following reaction is 0.497 at 500 K: PCl5(g) PCl3(g) + Cl2(g) Calculate the equilibrium partial pressures of all species when PCl5(g)
Calculate the pH at the equivalence point in titrating 0.010 M solutions of each of the following with 0.081 M NaOH. (b) hypochlorous acid (HClO), Ka = 3e-08 pH = _?_ It's not 8.3
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