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Problem- Calculate the concentration in % (m/m) of a solution containing 37.0 g of LiBr dissolved in 390.0 g of H2O.
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How much energy is required to boil 45.5g of water at 100 degrees C at sea level? The molar heat of vaporization of water is 40.6 kJ/mol.
Calculate the grams of solid Na2HPO4 that should be added to a 0.50M NaH2PO4 solution to make 50 mL of a buffer with a pH of 7.4; the ka for the NaH2PO4 is 6.2X10^-8
write the equation for self-ionization of water and why ammonia is a weak base.
explain the order of elution you observed while performing the gas chromatography for this experiment. what property of
when steam condenses to h2olliquid water heat of 2.26kj is released per gram. the heat from 168 grams of steam is used
What mass of CaCl2 , when dissolved in 100.00 g of water, gives an expected freezing point of 5.0°C; CaCl2 is ionic? What mass of glucose would give the same result?
Typical rate of deposit of dust (dustfall) from unpolluted air was reported as 10 tons per square mile per month. Express this dustfall in milligrams per square meter per hour.
The boiling point of pure CS2 is 46.30 oC, and its boiling point elevation constant Kb is 2.34 oC/m. A solution of sulfur in liquid CS2, which was prepared by dissolving 2.26 g S in 50.0 g CS2, boils at 46.71oC. What is the molecular formula of th..
exactly one mole of nitrogen gas confined within a cylinder by a piston is heated from 0degc to 873degc at 1.00 atm.a
Compute the change in Helmholtz energy (in kJ) if 3.33 moles of an ideal gas is isothermally expanded at 100. °C from 4.44 L to 7.77 L.
100.0 mL of 0.100 M acetic acid is placed in a flask and is titrated with 0.100 M sodium hydroxide. An appropriate indicator is used. Ka for acetic acid is 1.7 x 10^-5. AFTER 25.0 mL of NaOH is added, what is the pH in the flask at the following p..
How many grams of lead may be formed by the passage of 65.5 amps for 1.07 hours through an electrolytic cell that contains an aqueous Pb(IV) salt.
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