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Question
Calculate the quantity of lime and soda required for softening one million litres of hard water which on analysis was found to contain the following impurities.
Mg(HCO3)2 = 87.6 mg/lit. Mg (NO3)2
How many grams of hydrogen are collected in a reaction where 1.92 L of hydrogen gas is collected over water at a temperature of 40C and a total pressure of 738 torr.
The mass percent of sulfur in the product is Blank 1 % (2 dec places). The mass percent of oxygen in the product is Blank 2 % (2 dec places).
For the reaction a plot of equilibrium constant K vs 1/T Kelvin gave a line with a slop of -2100 K and y intercept of 4.53k. What is the value of standard enthalpy change for the reaction
mixture of the same bromoalkanes, and they both undergo hydroboration/oxidation to give a mixture of the same alcohols. Determine What is the structure of B?
a sample of gas occupies a volume of 364 ml at 1.28 atm and 27 oc. calculate the volume of the gas if its temperature
What is the result of the following subtraction expressed with the correct number of significant figures: 20.15 ? 10.569
the native conformation of a protein represents the lowest energy state of the polypeptide. would you expect it to be
5.0 mL of 12 M NH3 is added to 500 mL of 0.050 AgNO3. What concentration of silver ion will exist after equilibrium is established. [Kf for Ag(NO3)2 is 1.5 x 10^7]
Concentrated sulfuric acid has a concentration of 18 M. How much concentrated sulfuric acid would be needed to make 255 mL of 1.0 M sulfuric acid?
A current of 4.25 A is passed through a Pb(NO3)2 solution. How long (in hours) would this current have to be applied to plate out 9.40 g of lead?
a gas sample in an open manometer system has a pressure of 530 mmHg . The mercury column has a height of 545 mm on the gas sample side and a height of 425 mm on the air pressure side. what is the value of the air pressure in mmHg?
At what temperature will nitrogen gas (N2) have the same density as helium gas (He) at 27 degrees C and constant pressure
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