Chapter 10; The Mole

Question 1

Converting Particles to Moles.

Answer 1

number of representative particles x 1 mol/6.02 x 10^23 atoms = number of moles

Question 2

Moles-to-Mass Conversion

Answer 2

Moles Cr(example) x grams Cr/1 mol Cr = grams Cr

Question 3

Mass-to-Mole Conversion

Answer 3

mass Ca(example) x 1 mol Ca/grams Ca = moles Ca

Question 4

Mass-to-Atoms Conversion

Answer 4

mass Au x 1 mol Au/grams Au = moles Au

Question 5

Atoms-to-Mass Conversion

Answer 5

atoms He x 1 mol He/6.02 x 10^23 atoms He = moles He

Question 6

Mole-to-Mass Conversion for Compounds

Answer 6

1 mol S x 32.07g S/1 mol S =32.07 g S

6 mol C x 12.01g C/1 mol C =72.06g C

10 mol H x 1.008g H/1 mol H = 10.08g H

molar mass = (32.07g + 72.06g + 10.08g) = 114.21 g/mol (C3H5)2S

2.50 mol (C3H5)2S x 114.21g (C3H5)2S/1 mol (C3H5)2S = 286g (C3H5)2S

Question 7

Mass-to-Mole Conversion for Compounds

Answer 7

1 mol Ca x 40.08g Ca/1 mol CA =32.07 g

2 mol O x 16.00g O/1 mol O =72.06g

2 mol H x 1.008g H/1 mol H = 2.016g

molar mass = (32.07g + 72.06g + 10.08g) = 74.10g/mol Ca(OH)2

325g Ca(OH)2 x 1 mol Ca(OH)2/74.10 Ca(OH)2= 4.39 mol Ca(OH)2

Question 8

Converting Moles to Particles

Answer 8

number of moles x 6.02 x 10^23 representative particles/1 mol = number of representative particles