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Write a balanced equation including states of matter for the reaction of Zn(H2O)4 in aqueous NaCN.
A buffer is prepared by dissolving .0250 mol of sodium nitrite in 500 ml of 0.0329 M nitrous acid. Assume no volume change after NaNO3 is dissolved. calculate the pH of this buffer.
What is the molar solubility of Mn(OH)2 in a solution that is buffered at pH 8.00
Water is composed of 11.2% hydrogen and 88.8% oxygen. What mass of water contains 16.0g of hydrogen?
What is the ratio of oxygen atoms to hydrogen atoms in the mineral cacoxenite, Fe4(PO4)3(OH)3 • 12H2O?
A sample of neon effuses from a container in 79 seconds. The same amount of an unknown noble gas requires 161 seconds.
A baseball weighs 220 g. Top speed for a professional pitcher is about 100 mph when he throws a fast ball. Find the de Broglie wavelength
what is the partial pressure of argon? If the two flasksare connected through a stopcock and the stopcock is opened, whatis the total pressure?
When solid iodine is introduced into an evacuated vessel at 25 degrees Celcius, some of the iodine sublimes. Predict how the enthalpy, entropy, and free energy change in the system
Identify each of the following unbalanced aqueous reactions as an acid/base reaction (a), a redox reaction (r) or a precipitation reaction (p).
A sample of nitrogen gas in a 4.6-L container at a temperature of 30.°C exerts a pressure of 3.9 atm. Calculate the number of moles of gas in the sample.
A sample of a gas weighs 2.006 g and has a volume of 1060.0 mL at 795.0 torr and 32.0 degrees Celsius. What is its molar mass?
when 50.0 mL of 0.5M NaCl solution is combined with 100.0mL of 0.20M Na2SO4 solution, what is the concentration of sodium ions in the final solution.
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