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″}

How long does it take for a normal blood specimen, collected in a tube without any additives, to clot?

What does each letter of the NFPA code word that you answered in question 4 stand for?

All of the following are true of DNA except for:

_____________________ is an example of a type of cancer that is considered to be a genetic based cancer.