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A 3.900 g sample of an unknown substance was dissolved in 20 ml of cyclohexane. The density of cyclohexane is .779 g/ml. The freezing point depression was 1.8 C compute molar mass.
The Kw of water at 60 C is 9.5E-14. Explain what is the pH of a neutral solution at 60 C. Answer should be rounded to two decimal places.
So hardly change with temperature, determine the temperature in K at which the spontaneity of this reaction changes.
How many grams of sodium ion Na+ are in 2.50 g toothpaste. A toothpaste contains 0.24 by mass sodium fluoride used to prevent dental caries and 0.30 by mass triclosan , a preservative and antigingivitis agent
Write a balanced chemical reaction for the formation of a free fatty acid from a soap molecule under acidic conditions.
Give the bond angle and describe the shape around the central atom designated in this molecule. O in HO of H3PO4 (no H-P bond) a. trigonal planar; 120° b. trigonal planar;
Calculate the wavelength of the photon emitted when an electron makes a transition
Determine the molarity of Fe+3 ions and SO4-2 ions in a solution prepared by dissolving 48.05g of Fe2(SO4)3 in enough water to make 800.0mL of solution.
you have made up a solution of 100 mm tris ph 7.0. the pka of tris is8.0. compared to the situation at ph 7.0 about how
If Formic acid (HCO2H, Ka = 1.8 × 10-4) is the principal component in the venom of stinging ants. Define what is the molarity of a formic acid solution if 25.00 mL of the formic acid solution want 49.80 mL of 0.0567 M NaOH to reach the equivalence..
calculate the activation energy for a reaction if its rate constant increases from 10 to 45 s as the temperature increases from 298 to 315 k .
a gas cylinder witha volume of 3.00 dm^3 contains 8.00 moles of oxygen gas at a temperature of 50.0k. what is the pressure inside the cylinder.
net ionic equation for the reaction of 0.100 M nitrous acid with Barium hydroxide. Calculate the pH of the acid - I'm lost - can you help with the calculations
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