8. How many molecules of disulfur tetrachloride have a mass of 10.3 g? 6.2 x 10

Question

8. How many molecules of disulfur tetrachloride have a mass of 10.3 g?

6.2 x 1023 molecules

6.2 x 1022 molecules

3.01 x 1023 molecules

3.01 x 1022 molecules

0.05 molecule

7. What is the mass of 4.50 x 1023 atoms of magnesium, Mg?

7.48 x 1045 g

18.2 g

0.748 g

9.00 g

1.82 x 1047 g

6. What is the mass in grams of 0.250 mol of the common antacid calcium carbonate?

0.0250 g

25.0 g

1.50 x 1023 g

0.0400 g

400.0 g

6.2 x 1023 molecules

6.2 x 1022 molecules

3.01 x 1023 molecules

3.01 x 1022 molecules

0.05 molecule

Explanation / Answer

8.

MW of S2Cl4 = 108.0586 g/mol

then

mol = mass/MW = 10.3/108.0586 = 0.095318 mol

1 mol = 6.022*10^23

so

0.095318 mol = 0.095318*6.022*10^23 = 5.7400*10^22 molecules

NOTE Consider posting multiple questions in mutliple set of Q&A.

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