Molar Calculations

Question 1

Calculate the molar mass of neon gas, Ne.

Answer 1

20.18 g/mol

Question 2

Convert 7.11 grams of neon gas, Ne, to number of atoms.

Answer 2

2.12 × 10^23 atoms

Question 3

Convert 7.11 × 1021 atoms of neon gas, Ne, to grams.

Answer 3

0.238 g

Question 4

Calculate the molar mass of phosphorus trihydride, PH3.

Answer 4

33.99 g/mol

Question 5

Convert 2.431 grams of phosphorus trihydride, PH3, to number of molecules.

Answer 5

4.307 × 10^22 molecules

Question 6

Convert 2.431 grams of phosphorus trihydride, PH3, to number of each type of atom.

Answer 6

P: 4.307 × 10^22 atoms

H: 1.292 × 10^23 atoms

Question 7

Convert 2.431 × 1021 molecules of phosphorus trihydride, PH3, to grams.

Answer 7

0.1372 g

Question 8

Calculate the molar mass of potassium sulfide, K2S.

Answer 8

110.26 g/mol

Question 9

Convert 0.625 grams of potassium sulfide, K2S, to number of molecules.

Answer 9

3.41 × 10^21 molecules

Question 10

Convert 0.625 grams of potassium sulfide, K2S, to number of each type of atom.

Answer 10

K: 6.83 × 10^21 atoms

S: 3.41 × 10^21 atoms

Question 11

Convert 6.25 × 1028 molecules of potassium sulfide, K2S, to grams.

Answer 11

11,400,000 g

Question 12

Calculate the molar mass of glucose, C6H12O6.

Answer 12

180.16 g/mol

Question 13

Convert 1.50 grams of glucose, C6H12O6, to number of molecules.

Answer 13

5.01 × 10^21 molecules

Question 14

Convert 1.50 grams of glucose, C6H12O6, to number of each type of atom.

Answer 14

C: 3.01 × 10^22 atoms

H: 6.02 × 10^22 atoms

O: 3.01 × 10^22 atoms

Question 15

Convert 1.50 × 1021 molecules of glucose, C6H12O6, to grams.

Answer 15

0.449 g

Question 16

Calculate the molar mass of progesterone, C21H30O2 (a female hormone).

Answer 16

314.45 g/mol

Question 17

Convert 25.00 grams of progesterone, C21H30O2 (a female hormone), to number of molecules.

Answer 17

4.788 × 10^22 molecules

Question 18

Convert 25.00 grams of progesterone, C21H30O2 (a female hormone), to number of each type of atom.

Answer 18

C: 1.005 × 10^24 atoms

H: 1.436 × 10^24 atoms

O: 9.575 × 10^22 atoms

Question 19

Convert 2.500 × 1020 molecules of progesterone, C21H30O2 (a female hormone), to grams.

Answer 19

0.1305 g