Q: Why was the mole of oxygen molecules excited when he walked out of the singles bar? A: He got Avogadro's number!
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5  

Why did the Mexican take Xanax? For hispanic attacks.
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An instructor in chemical warfare asked soldiers in his class: "Anyone knows the formula for water?" "Sure. That's easy," said one man. "What is it?" "H, I, J, K, L, M, N, O." "What, what?" reasked the instructor. "H to O," explained the chemistry expert.
 1043
1  

Q: What did the scientist say when he found 2 isotopes of helium? A: HeHe
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A biologist, a chemist and a statistician are out hunting. The biologist shoots at a deer and misses 5th to the left. The chemist takes a shot and misses 5th to the right. The statistician yells "We got 'em!"
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