Use the periodic table to identify atom properties such as groups and electron configurations. Elements are organized by period and group, with the period corresponding to the principle energy level, and the group relating to the extent the subshells are filled.
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Answer: 22.48 g
Reason: Because Mg reacts with O2 in a 2:1 ratio you would divide 2.81 by two. 2.81/2=1.405 You would then multiply 1.405 by the molar mass of O2 which is 15.999 and get the final answer of 22.48 g.
Answer:
3 Hz
The frequency is three waves per second, or 3 Hz.