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Lactose is a sugar most commonly found in milk and is made up of carbon, hydrogen and oxygen. After analyzing a sample of it there was found to be 42.1 % of carbon, 6.46% of hydrogen and 51.4% of oxygen by mass. What is the molecular formula of lactose if its molar mass is 342.3 g/mol?
Calculate the pH for each of the following cases in the titration of 50.0 mL of 0.120 M HClO(aq) with 0.120 M KOH(aq). The ionization constant for HClO is 4.0×10-8
A student wanted to determine the molar concentration of acetic acid in a commercial vinegar sample. He used a volumetric pipet to deliver 3.00 mL of vinegar to an Erlenmeyer flask, added about 30 mL of water and 3 drops of phenolphthalein indicat..
Calculate the pH of a solution that is 0.25M pyridine, C5H5N and 0.75M in pyridinium bromide, C5NHBr. (Kb for C5H5N= 1.7 * 10^-9)
the pressure exerted on a 240 ml sample of hydrogen gas at constant temperature is increased from .428 atm to .724 atm.
If Delta H = -80.0 KJ and Delta S = -0.200 KJ/K, the reaction is spontaneous below a certain temperature. Calculate that temperature.
One kilogram of steam in a piston/ cylinder device undergoes the following changes of state. calculate Q and W for each step
A 30.5 g sample of an alloy at 91.8°C is placed into 50.5 g water at 22.1°C in an insulated coffee cup. The heat capacity of the coffee cup (without the water) is 9.2 J/K.
Delta G for the reaction Ag2 O(s)----->2Ag(s)+1/2 O2(g) is +11 kJ/mole. What will be the value of delta G for this reaction at 25 C when the oxygen pressure is 0.19 atm. A. 6.9 kJ/mol B. 8.9 kJ/mol C. 10 kJ/mol D. 13 kJ/mol
Calculate the pH of a solution that is .15 M Na2HPO4(aq) and .44 M Na3PO4(aq). Not sure how to solve it. The ka1 of H3PO4 is 7.6 x 10^-3, pKa1 is 2.12, ka2 is 6.2 x 10^-8, pka2 is 7.21, ka3 is 2.1 x 10^-13, pka3 is 12.68.
The isomerization of cyclopropane to form propene is a first-order reaction. At 760 K, 85% of a sample of cyclopropane changes to propene in 79.0 min. Determine the rate constant for this reaction at 760 K
The volume of a sample of hydrogen is 798mL and it exerts 621mmHg pressure at 5.00C. what volume does it occupy at standard temperature and pressure.
how many grams of carbon are required to react with 1.5x10^25 atoms of hydrogen to form CH4
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