the number of molecules present in 14.8 grams of Ca(OH)2the number of molecules present in 14.8 grams of Ca(OH)2the number of molecules present in 14.8 grams of Ca(OH)2the number of molecules present in 14.8 grams of Ca(OH)2
Answers
Answer:
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Explanation:
Mole & Molar Mass
Mole (mol): the amount of material counting 6.02214 × 1023 particles
The value of the mole is equal to the number of atoms in exactly 12 grams of pure
carbon-12.
12.00 g C-12 = 1 mol C-12 atoms = 6.022 × 1023 atoms
The number of particles in 1 mole is called Avogadro’s Number (6.0221421 x 1023).
6.022 ×1023 atoms
1 mol or 1 mol
6.022 ×1023 atoms
Converting between Number of Moles and Number of Atoms
Calculate the number of atoms in 2.45
mol of copper.
A silver ring contains 1.1 x 1022 silver
atoms. How many moles of silver are in
the ring?
2.45 mol Cu ×
6.022 ×1023 atoms
1 mol
= 1.48 × 1024 atoms Cu
1.1 ×1022 atoms Ag ×
1 mol
6.022 ×1023 atoms
= 1.8 × 10-2 mol Ag
Molar Mass: the mass of 1 mol of atoms of an element
An element’s molar mass in g/mol is numerically equal to the element’s atomic mass in
amu.
1 mol C
12.01 g C or
12.01 g C
1 mol C
Converting between Mass and Number of Moles Converting between Mass and Number of Atoms
Calculate the moles of carbon in 0.0265 g of
pencil lead.
How many aluminum atoms are in a can
weighing 16.2 g?
0.0265 g C ×
1 mol C
12.01 g C
= 2.21 × 10-3 mol C
16.2 g Al ×
1 mol Al
26.98 g Al ×
6.022 ×1023 atoms
1 mo
(a) 449 g of potassium
(b) 11.8 g of Ar
(c) 2.16 x 1024 atoms of lead
3. What is the mass of each of the following?
(a) 1.9 x 1024 atoms of Pb (in g)
(b) 4.87 x 1025 atoms of Zn (in kg)
(c) 2.33 x 1020 atoms of oxygen (in ng)
4. How many molecules are in 2.50 moles of CO2?
5. Calculate the mass , in grams, of 0.433 mol of calcium nitrate.
Hint: Formula Weight of Ca(NO3)2 = (AW of Ca) + 2(AW of N) + 6 (AW of O)
6. Calculate the number of H atoms in 0.350 mol of C6H12O6
References:
Tro, Chemistry: A Molecular Approach 2nd ed., Pearson
Brown/LeMay/Bursten, Chemistry: The Central Science, 12th ed., Pearson
Answers
(a) 2.26 × 10 1. 24 silver atoms; (b) 1.42 × 1024 xenon atoms (c) 3.07 × 1027 phosphorus atoms
(a) 11.5 moles; (b) 0.295 moles Ar; (c) 3.59 moles 2.
(a) ) 6.5 × 10 3. 2
g; (b) 5.29 kg; (c) 6.19 × 106
ng
1.51 x 10 4. 24 2.53 x 10 6. 2)3 Ca(NO 71.1 g 5. atoms; 24 H atoms