14) Element X has three naturally occurring isotopes. The masses (amu) and % abundances of the isotopes are given in the table below. What is the average atomic mass of the element in amu?
38X abundance os 5.07 and mass of 39.919
39x abundance of 15.35 and mass of 39.017
42x abundance of 79.85 and mass of 42.111
15. Classify each of the following elements as alkali, alkaline earth, halogen or a noble gas:
a) He ________________________
b) F ________________________
c) Na ________________________
d) Ca ________________________
e) Br
The recommended adult dose of Elixophyllin , a drug used to treat asthma, is 6.00 mg/kg of body mass. Calculate the dose in milligrams for a 134-lb person
13. It is 273 K outside. Do you need a jacket? Why or why not? (show your work for full credit
14) Element X has three naturally occurring isotopes. The masses (amu) and % abundances of the isotopes are given in the table below. What is the average atomic mass of the element in amu?
38X abundance os 5.07 and mass of 39.919
39x abundance of 15.35 and mass of 39.017
42x abundance of 79.85 and mass of 42.111
15. Classify each of the following elements as alkali, alkaline earth, halogen or a noble gas:
a) He ________________________
b) F ________________________
c) Na ________________________
d) Ca ________________________
e) Br
The recommended adult dose of Elixophyllin , a drug used to treat asthma, is 6.00 mg/kg of body mass. Calculate the dose in milligrams for a 134-lb person
13. It is 273 K outside. Do you need a jacket? Why or why not? (show your work for full credit
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