Calculating Mass, Moles, Atoms, and Molecules Worksheet DIRECTIONS: Using the masses on the periodic table, calculate the desired quantity.

1.1.5413×1017 atoms of Ca to grams

2.95.45 grams of SF4 to moles

3.95.6 moles of Sr to grams

4.34.35 moles of Ga to atoms

5.544.6 moles of DyPO4 to grams

6.780.5 grams of Zn5(P3O10)2 to moles

7.2.25104 moles of BF3 to molecules

8.4.3453×1022 molecules As2O5 to grams

9.75.56 moles of Al(NO3)3 to grams

10.Chloral hydrate (C2H3O2Cl3) was used as a sedative and hypnotic.

a. What is the molar mass of chloral hydrate?

b. How many moles of chloral hydrate are in 500.0 grams chloral hydrate?

c. How many atoms of chlorine are in 500.0 grams of chloral hydrate?

d. What mass of chloral hydrate would contain 1.600×1022 atoms of oxygen?

most historians agree that gabriel mouton, the vicar of st. paul’s church in lyons, france, is the “founding father” of the metric system. he proposed a decimal system of measurement in 1670. mouton based it on the length of one minute of arc of a great circle of the earth (now called a nautical mile, 1852 meters). he also proposed the swing-length of a pendulum with a frequency of one beat per second as the unit of length (about 25 cm). a pendulum beating with this length would have been fairly easy to produce, thus facilitating the widespread distribution of uniform standards. over the years, his work was revised, improved, and extended by a number of french scientists.

the political sponsor of weights and measures reform in the french revolutionary national assembly was the bishop of autun, better known as talleyrand. under his auspices, the french academy appointed several committees to carry out the work of developing a usable system of weights and measures for france. one of the committees recommended a decimalized measurement system based upon a length equal to one ten-millionth of the length of a quadrant of the earth’s meridian (i.e., one ten-millionth of the distance between the equator and the north pole).

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