Chemistry Worksheet NAME:
Moles, Molar Mass, and Avogadro's Number
Show all work for problems that require calculations.
1. How many atoms are there in one mole of carbon?
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2. What is the mass of one mole of carbon atoms?
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3. What is the mass of 5.0 mole of Barium?
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4. How many moles of tin atoms are there in 250 grams of tin?
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5. How many atoms are there in 250 grams of tin?
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6. How many atoms are there in 5.0 grams of gold?
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7. What is the mass of 6.56 mole of Nitrogen?
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8. How many moles of water molecules are there in 39 grams of Chlorine?
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9. How many molecules are there in 39 grams of Gold
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10. What is the mass of 6 02 * 10 ato
atoms of aluminum?

What type of solution is formed if 10 g of kclo3 are dissolved in 100g of water at 30

Astudent made a graph plotting the progress of a reaction over time. the student forgot to label the y-axis of the graph. a graph is shown with two graph lines. one graph line starts at a higher position on the y axis and slopes downwards towards the right. the other graph line starts at a lower position on the y axis and slopes upwards towards the right. the two graph lines stop short of intersecting each other and continue as separate lines which gradually become straight and parallel to the x axis. a vertical line is shown at a point where the two graph lines finally became parallel to the x axis. this vertical line is labeled equilibrium. the title on the x axis is time and an arrow pointing towards the right is shown above time. the title on the y axis is left blank. what best explains the label that the student should use on the y-axis? amount, because as the amount of product decreases, the amount of reactant increases over time. reaction rate, because forward and backward reaction become equal at equilibrium. amount, because the amounts of reactants and products become constant after equilibrium is reached. reaction rate, as the rate of forward reaction increases and rate of backward reaction decreases over time.

Consider the following reactions. (note: (s) = solid, (l) = liquid, and (g) = gas.) mg(s) + ½o2(g) → mgo(s) + 146 kcal/mole h2(g) + ½o2(g) → h2o(g), δh = -57.82 kcal/mole what type of reaction is represented by the previous two examples?