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?
Ans.
2. What is the mass of one mole of carbon atoms?
Ans.
3. What is the mass of 5.0 mole of Barium?
Ans.
4. How many moles of tin atoms are there in 250 grams of tin?
Ans
5. How many atoms are there in 250 grams of tin?
Ans.
6. How many atoms are there in 5.0 grams of gold?
Ans
7. What is the mass of 6.56 mole of Nitrogen?
Ans
8. How many moles of water molecules are there in 39 grams of Chlorine?
Ans
9. How many molecules are there in 39 grams of Gold
Ans
10. What is the mass of 6 02 * 10 ato
atoms of aluminum?

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Explanation:

the best answer is d because the strong cohesion is caused by the ability of water molecules to undergo hydrogen bonding.

a is incorrect because when water solidifies, it becomes   ice, which expands and occupies a bigger volume for the same mass of water in its liquid state.

b is incorrect because water has high surface tension. besides bonding to itself it hydrogen bonds to other molecules at the top decreasing possibility for breaking of attractive forces.

c is incorrect because the water molecule has oxygen which is highly electronegative and so pulls the electron pair towards itself creating a dipole moment, making the molecule polar.

e is incorrect because water has strong adhesion, ability to stick to other molecules such as glass because of this molecules having stronger hydrogen bonding than water.

there is none because earth is stationary and flat.