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Copper has two isotopes: Cu-63 (abundance = 69.2%, mass = 62.930 amu) and Cu-65 (abundance = 30.8%, mass = 64.928 amu). Calculate the (average) atomic mass of copper.
As early as 1938, the use of NaOH was suggested as a means of removing CO2 from the cabin of a spacecraft according to the following (unbalanced) reaction: NaOH + CO2 → Na2CO3 + H2O.
What is the value of the investment today and what would the value be if the payments occurred for 39 years?
Value of E: 1.3 g x 1 mole/100.09=1.29 x 10-2 moleCaCO3 Using the value in your answer to question E., calculate the number of moles of HCl that two TUMS
A glass of milk has a volume of 100ml. if the milk has a mass of 103g, what is the density of milk?
Give the number of valence electrons of each element and draw the Lewis structure for each molecule.
An aqueous antifreeze solution is 35.0% ethylene glycol (C2H6O2) by mass.
At 105 °C, the reaction 2NO2(g) ? N2O4(g) has Kp = 0.054. What is the value of Kc at this temperature?
Adria Lopez created Success Systems on October 1, 2013. The company has been successful, and its list of customers has grown. To accommodate the growth, the accounting system is modified to set up separate accounts for each customer.
Describe the development of the modern periodic table. Include contributions made by Lavoisier, Newlands, Mendeleev, and Moseley.
A current of 4.67 A is passed through a Sn(NO3)2 solution for 1.80 hours
A physician wrote a prescription for Tylenol 325 mg/5mL with codeine 10 mg/5mL, 5mL three times a day for 4 days as needed for cough. How much Tylenol in milligrams is contained in a teaspoonful?
If 158 mL of wet H2 is collected over water at 24C and a barometric pressure of 737 torr, how many grams of Zn have been consumed?
Write down the full Hamiltonian for a He atom moving freely in space, i.e., there is no external potential. b) Now assume there is no repulsion between the electrons
Draw the structure of methyl red, and explain why it absorbs in the visible region of the spectrum. using resonance, explain why the acid form has a wavelength of max absorption at longer wavelength
How is the rate of consumption of O2 related to the rate of consumption of NH3? (b) How is the rate of formation of NO related to the rate of consumption of NH3? (c) How is the rate of formation of H2O related to the rate of consumption of NH3?
The total pressure in the system is found to be 3.0 atm and the mole fraction is 0.12. Find K(pressure) Can someone explain all the steps to get to the answer?
what is the corresponding pressure difference between points A and B, in mmHg. At which point (A or B) is the pressure higher, and why? The temperature is 60 °F throughout
Determine the boiling point of a solution of 22.5 g of fructose, C6H12O6 , in 294 g of phenol.
How many grams of sodium formate, NaCHO2, must be added to 750.0mL of .250 M of formic acid, HCHO2, to obtain a buffer with pH of 5.5 ?
How many kilograms of sodium carbonate must be added to neutralize 2.01×103 kg of sulfuric acid solution?
How many grams of CO are needed to react with an excess of Fe2O3 to produce 558 g Fe? The equation for the reaction is: Fe2O3(s) + 2 CO(g) → 3 CO2(g) + 2 Fe(s)
A 706 mL gas sample at STP is compressed to a volume of 248 mL, and the temperature is increased to 39?C. What is the new pressure of the gas in Pa.
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