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Please show all work. a substance composed of only N and O has the composition by mass 69.57% O.
What is the molecular formula of this compound if the molar mass is 92 g/mol.
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what is the temp of the final solution after thermal equilibrium is established? The heat of neutralization -56kj/mol. Assume there is not heat lost to the surroundings. Also assume the specific heat of the solution is 1.0 Cal/g*c and the density ..
A buffer consists of 0.20 M KHCO3 and 0.44 M K2CO3. Carbonic acid is a diprotic acid with Ka1 = 4.5 multiplied by 10-7 and Ka2 = 4.7 multiplied by 10-11.
The pressure of 9.0 L of an ideal gas in a flexible container is decreased to one-eighth of its original pressure, and its absolute temperature is decreased to one-forth of the original. What is the final volume of the gas?
Determine the unknown quantity (?) for the following electrochemical cells. Sn(s) + 2H+(pH = ?) ? Sn2+(0.25 M) + H2(0.50 atm) Ecell = 0.0493 V
Np-237 (atomic mass= 237.0 amu) has a half life of 2.20x10^6 years. The isotope decays by alpha emission. a) Write a balanced nuclear reaction for the decay of neptunium-237.
Suppose that a radiologist who is 4.0 m from a small, unshielded source of radiation receives 3.4 units of radiation. To reduce the exposure to 0.34 units of radiation, to what distance from the source should the radiologist move?
What is the pH at the equivalence point? what is the pH at the 10.0 mL base added? what is the pH at the 30.0 mL base added?
Depending on temperature, RbCl can exist in either the rock-salt or CsCl structure type. Give the cation and anion coordination number for each structure type.
Consider the dissolution of magnesium (s) in an aqueous hydrochloric acid solution. What minimum amount of 1.85 M hydrochloric acid is nessecary to produce 28.5 L of hydrogen at STP
polonium metal crystallizes in a lattice which contains onlyone po atom per cubic unit cell. the radius of a polonium
A chemical process is designed to produce ethylene from ethane according to the reaction: C2H6 (ethane) ? C2H4 (ethylene) + H2 The fresh feed to the process contains pure ethane at a flowrate of 100 mole/min. The fresh feed is mixed with a recycl..
If 2.078 g of Smarties® requires 2.11 mL of 0.250 M Na2CO3 to reach the endpoint, how many moles of acid is there in each gram of the candy?
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