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1. Complete combustion of 3.90 g of a hydrocarbon produced 12.0 g of CO2 and 5.54 g of H2O. What is the empirical formula for the hydrocarbon?
2. A compound is 54.53% C, 9.15% H, and 36.32% O by mass. A. What is its empirical formula? The molecular mass of the compound is 132 amu. B. What is the molecular formula?
3. What is the empirical formula of a compound composed of 3.25% hydrogen (H), 19.36% carbon (C), and 77.39% oxygen (O) by mass?
Calculate that how many grams of potassium chloride remain dissolved and how many grams came out of this given solution?
Calculate the standard enthalpy of the reaction for the oxygenation of deoxyribose to ribose
Draw a quantitative predominance (pH-pC) diagram for the system of 10^-4 M benzoic acid.
If it takes 52 J of energy to warm 7.40g of water by 17°C, how much energy would be needed to warm 7.40g of water by 55 °C
Describe a simple and practical way to make 1.00 L of this buffer solution, assuming a 1.0 M solution of the molecular base is available and that the chloride salt of the conjugate acid is available as a solid
If a chemistry student collected 834 mL of gas at 25 degrees C and 8.00 x 10^2 torr, how many moles did she collect?
If 6.73 g of Na2CO3 is dissolved in enough water to make 250. mL of solution, what is the molarity of the sodium carbonate?
C7H6O3 + CH3OH --> C8H8O3 + H2O In an experiment 1.50 g of salicylic acid (C7H6O3) is reacted with 11.20 g of methanol (CH3OH).
Bond Energies, Using the bond energies below, determine the value and sign of delta H for the
what is the molar concentration of the salt solution formed in this reaction? 3. what is the molar concentration of the excess reactant once this reaction has finished?
use the concept of electron configurations to explain why the number of alence electrons in metals tends to be less then the number in most nonmetals.
What is the value of Î"Go in kJ at 25 oC for the reaction between the pair: I2(s) and Br-(aq) Use the reduction potentials for I2(s)
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