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A chemical formula is a way of presenting information about the chemical proportions of atoms that constitute a particular chemical compound or molecule, using chemical element symbols, numbers, and sometimes also other symbols, such as parentheses, dashes, brackets, commas and plus (+) and minus (−) signs.
Traditionally, only half of eligible Hispanic voters vote (around 7% of voters); of them, 71% voted for Barack Obama (increasing his percentage of the vote by 5%); therefore, the Hispanic vote was an important factor in Obama's re-election, since the vote difference between the two main parties was only 3.9% [143] [144] [145] [146]