The concentration (M) of HCl in a solution prepared by dissolving 5.5 g of HCl in 200 g of C2H6O is ________ M. The density of the solution is 0.79 g/mL. YOU MUST SHOW YOUR WORK FOR THIS PROBLEM

Which of the following correctly represents the third ionization of aluminum?

 When the following equation is balanced, the coefficients are ________.                                       Al(NO3)3 + Na2S → Al2S3 + NaNO3

 The temperature of a 15-g sample of lead metal increases from 22 °C to 37 °C upon the addition of 29.0 J of heat. The specific heat capacity of the lead is ________ J/g-K. YOU MUST SHOW YOUR WORK FOR THIS PROBLEM

The element X has three naturally occurring isotopes. The masses (amu) and % abundances of the isotopes are given in the table below. The average atomic mass of the element is ________ amu. The answer should be displayed to the correct number of significant figures. YOU MUST SHOW YOUR WORK FOR THIS PROBLEM              

Calcium carbide (CaC2) reacts with water to produce acetylene (C2H2) as shown in the reaction below:             CaC2 (s) + 2H2O (g) → Ca(OH)2 (s) + C2H2 (g)  How many grams of H2O are required to completely react with 82.4 g of CaC2? YOU MUST SHOW YOUR WORK FOR THIS PROBLEM

The correct answer (reported to the proper number of significant figures) to the following is _______.                                           6.3 × 3.25 = ________

Consider the following two reactions:              A → 2B    ΔH°rxn = 456.7 kJ/mol             A → C      ΔH°rxn = -22.1 kJ/mol  Determine the enthalpy change for the process: YOU MUST SHOW YOUR WORK FOR THIS PROBLEM             2B → C

A 210. Lb. person is required to take a medication at a dose of 5.00 mg per kg of body weight twice a day. How much medication would the person take in a 24-hour period? (Indicate the number in proper scientific notation with the appropriate number of significant figures.) YOU MUST SHOW YOUR WORK FOR THIS PROBLEM

Rationalize the following expression: 63{“version”:”1.1″,”math”:”63″}