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A compound is composed of 5.045g of carbon, 0.847g of hydrogen and 3.36g of oxygen. Find the empirical formula for this compound knowing that H = 1g/mole , O = 16g/mole and C =12 g/mole.
Determine the boiling point of a solution of 10 grams of a substance of molecular weight 94 g/mol in 500 grams water.
Does the hydrogen atom form covalent bond as well as ionic bonds? Why?
What is the total number of moles of atoms present in 1 mole of (SO4)3 (PO4)2?
How many valence electrons are in an atom of chlorine
First Law of Thermodynamics and Calorimetry
A gas system with constant pressure has change in internal energy of 240 J. Heat was lost to the surroundings and 150 J work was done to the surroundings as well. How many calories of heat was lost?
315 moles of butane (C4H10) was burned in a copper calorimeter containing 5065 g of water. The calorimeter weighs 2,800 g. The temperature was observed to increased by 3.15 °C. Calculate the molar heat of combustion of butane. The specific heat of copper and water are 0.386 J/g. °C and 4.18 J/g. °C respectively.
A 60-g silver spoon (specific heat 0.233 J/g °C) at 25 °C is placed in 180 g of coffee at 85 °C and the temperature of the two become equal. What is the final temperature when the two become equal? The coffee has specific heat of 5.12J/g. °C.
Describe the effect on pH (increase decrease or no change) that results from each of the following additions:
a. Potassium acetate to an acetic acid solution
b. Ammonium nitrate to an ammonia solution
C. Sodium formate to a formic acid solution
D. Potassium chloride to a hydraulic acid solution
E. Barium iodide to a hydroiodic acid solution
The pkas of two monoprotic acods HA and HB are 5.9 and 8.1 respectively. Which of the two is the stronger acid?
Romeo, an alcoholic man, made an aqueous solution of HCl that contains 42 % HCl by mass. (Note that an aqueous solution is water that contains one or more dissolved substances. Because the solution is 42% HCl, it contains 42g HCl and 58g H2O.) calculate the mole fraction and molality
What mass of lead (II) iodide will be formed when 20.0 g of lead (II) nitrate is added to 33.0 g of potassium iodide?
