Chemistry Module 8 Study Guide Graded A

Chemistry - Module 8 Study Guide Graded A+

1). How many carbon atoms are present in 0.92 moles of ch3?

 Ans: 1.66 x 1024 atoms


2). How many moles are in 1.16 x 1025 atoms of h2co3?

 Ans: 19.3 moles of H2CO3


3). How many atoms of hydrogen atoms are found in 3.94 mol of nh5?

 Ans: 1.19 x 1025 Hydrogen Atoms


4). How many molecules are in 3.9 moles of water?

 Ans: 2.3 x 1024 molecules of water


5). How many moles are there in 1.3 x 1024 atoms of calcium?

 Ans: 2.2 moles of Ca


6). How many moles are in 132.3 grams of carbon dioxide?

 Ans: 3.007 moles


7). How many moles are in 15 grams of oxygen gas (o2) ?

 Ans: .469 moles of O2


8). How many moles are in 20.50 grams of nh3?

 Ans: 1.204 moles




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, 9). The molar mass of h20 is _______ grams per mole.

 Ans: 18.01


10). The molar mass of nacl is ______ grams per mole.

 Ans: 58.44


11). How many grams are in 6.983 moles of baking soda (nacho3)?

 Ans: 586


12). The molar mass of cu(oh)2 is _________ grams per mole.

 Ans: 97.55


13). How many grams are in 1.5 moles of water?

 Ans: 27 grams


14). How many moles are in 4.24 g of na2co3?

 Ans: .04 moles


15). How many grams are in 3.396 moles of al2s3?

 Ans: 509.9 grams


16). Calculate the mass of hydrogen in 250 g of c2h3o2

 Ans: 12.83 grams


17). What is the percent composition of nitrogen in nh4?

 Ans: 77.6%


18). Calculate the mass of carbon in 250 g of c2h3o2

 Ans: 101.73 grams




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