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 1 If there were 1,500,374,908 hydrogen atoms in a collection of H2O molecules, how many oxygen atoms were there?
 2 At the beginning of a distillation experiment there were 233 ml of methanol in a boiling flask. At the end of the experiment, there were 87 ml. How many milliliters of methanol were removed from the flask?
 3 Lauren carefully monitored the temperature in a reaction flask as it was slowly heated in a heating blanket. The temperature rose 35 degrees in 5 minutes. What was the rate of temperature rise in degrees per minute?
 4 * This is a pre-made sheet.Use the link at the top of the page for a printable page.
 5 Mr. Bloop added 17 grams of salt to 39 grams of sugar and then added an amount of sand equal to the total mass of the salt and sugar he already had. Nobody knows why he did this-he just did it. What was the total mass of the mixture when he was finished?
 6 Joshua measured the mass of a solid he obtained after crystallizing an organic compound from ice cold water. The last time he did the experiment he obtained 10 grams of crystals. This time he obtained three times that much but lost two grams by accident. How many grams did he finally have at the end of today's experiment?