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A 0.4780-g sample of impure Ca(OH)2 is dissolved in enough water to make 57.00 mL of solution. 20.00 mL of the resulting solution is then titrated with 0.1140-M HCl. What is the percent purity of the calcium hydroxide if the titration requires 34.55 mL of the acid to reach the endpoint?
When steam (hot water) is passed over iron, hydrogen gas and iron (3) oxide are formed. What weight of steam would be needed to react completely with 100.0g of iron.
Compute the free energy change needed for transport of sufficient protons to make gastric juice of 1 litter at the temperature of 37 degree celsius hence expect above reaction will happen spontaneously?
How many mL of 0.525M calcium chloride are needed to obtain 5.00x10 22 chloride ions.
A piston has an external pressure of 11.0 bar . How much work has been done if the cylinder goes from a volume of 0.150 liters to 0.570 liters.
A proton in a linear accelerator has a de Broglie wavelength of 127 pm. what is the speed of the proton?
suppose you wanted to dissolve 106 g of Na2CO3 in enough H2O to make 6.00L of solution what is the molar mass of Na2CO3.
A 29.0-g sample of water at 260. K is mixed with 51.0 g water at 340. K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.
Oxalic acid, H2C2O4 has acid dissociation constants Ka1 = 5.9 x 102 and Ka2 = 6.4 x 105. What is the pH after 20.00 mL of 0.0500 M NaOH is added to 5.00 mL of 0.2000 M H2SO3.
the equilibrium contant kc=49 at 230^0C, for the reaction PCl3 + Cl2= PCL5. If 0.50mol of each of phosphorus trichloride and chlorine are added to a 5.0L reaction vessel.
Determine the empirical and molecular formulas of Ibuprofen has 75.69% C, 8.80%H and 15.51%O by mass and has a molar mass about 206g/mol.
Zinc has two isotopes. Zn-64 has an atomic mass of 63.9292amu and Zn-72 has an atomic mass of 71.9278amu. Its average atomic mass is 65.38amu. Calculate the abundance, in percent, of Zn-64.
If the formula for magnesium fluoride is MgF 2 and the formula for potassium chlorate is KClO 3 , then what is the formula for magnesium chlorate?
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