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A 53.8-mg sample of sodium perchlorate contains radioactive chlorine-36 (whose atomic mass is 36.0 amu). If 29.6% of the chlorine atoms in the sample are chlorine-36 and the remainder are naturally occurring no radioactive chlorine atoms, how many disintegrations per second are produced by this sample? The half life of chlorine-36 is 3.0*10^5 yr.
How many grams of magnesium are needed to prepare 3.15 L of H2 at 730 mmHg and 26 celsius?
Write a chemical equation (with phase symbols) to show what happens to a formula unit of Pb(NO3)2 when it is dissolved in water. What is the molarity of this solution?
calculate the molarity of a solution made by dissolving 12.5 grams of Na2CrO4 in enough water to form exactly 550mL of solution
Calculate the hydronium ion concentration and the pH after the addition of 0.25 mL of 0.10 M HCl to each one. What accounts for the difference in the hydronium ion concentrations
an automobile achieves a gas mileage of 34.0 mi/gal. how many kilometers can it travel on 1.5 L of gasoline.
Which ions were present in the original solution? What are the net ionic equations for each reaction that occured?
A rigid container of O2 has a pressure of 388kPa at a temperature of 713K. What is the pressure at 273K.
The pressure in an oxygen tank stored at 0°C is 10.0 atm. What pressure will develop in the tank if it is heated in a fire to 500°C?
Calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition
The speed of a certain electron is 995 km s-1. If the uncertainty in its momentum is to be decrease to 0.0010 per cent, Explain what uncertainty in its location must be tolerated
Complete and balance the molecular equation, including phases, for the reaction of aqueous copper(II) chloride, CuCl2, and aqueous potassium phosphate, K3PO4.
Using the de Broglie and Planck-Einstein formulas, and considering (A) a helium atom with a kinetic energy of 0.0025eV (i.e, thermal energy at 300K) and (B) a baseball (mass=500g) moving at 49m/s, evaluate and interpret the wavelength and frequenc..
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