3. The total volume of seawater is 1.5 x 102¹ L. Assume that seawater contains 3.1% NaCl by mass (this means that there are 3.1 g NaCl in 100 g solution) and that its density is 1.03 g/mL, calculate the total mass of NaCl in the seawater in kilograms. Note that 1 kg = 1000 g.

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Chapter1: Chemical Foundations
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3. The total volume of seawater is 1.5 x 1021 L. Assume that seawater contains 3.1% NaCl by mass
(this means that there are 3.1 g NaCl in 100 g solution) and that its density is 1.03 g/mL, calculate
the total mass of NaCl in the seawater in kilograms. Note that 1 kg = 1000 g.
4. Copy the table and fill in the blanks with the appropriate values, symbols and the like: (Note: You
can use a periodic table to locate the element.)
5.
6.
7.
8.
SYMBOL
protons
neutrons
electrons
net charge
Which of the following are:
(a) SO₂
(b) Sg
5
6
5
Write only the letter of your choice.
(c) Cs
(d) N₂O5
56
26
A. Molecules but not compounds
B. Compounds but not molecules
C. Both compounds and molecules
Which of the following has more atoms?
A. 1.10 g of hydrogen (H) atoms
B. 14.7 g of chromium (Cr) atoms
2+
Fe
CHEM01-(09-101P) Problem Set No. 1
(e)
(f) 0₂
o o
Which of the following has a greater mass?
A. 2.0 atoms of lead
B. 5.1 x 1023 mole lithium
16
18
- 3
79
117
79
(g)
CH4
(h) KBr
86
136
0
Write the letter of your choice and support your answer with computations. No solution, no
credit.
(i) P4
(₁) LiF
Calculate the number of C, H and O atoms in 1.50 g of glucose, C6H12O6. There should be 3
answers.
page 2
Write the letter of your choice and support your answer with computations. No solution, no
credit.
9. Stannous fluoride (SnF₂) is often added to toothpaste as an ingredient to prevent tooth decay.
What is the mass of fluorine (in grams) in 24.6 g of the compound?
10. Determine the mass percent composition of each element in calcium silicate CaSiO3.
11. A compound is found to contain 23.3% magnesium, 30.7% sulfur, and 46.0% oxygen. What is the
empirical formula of this compound?
12. The complete combustion of acetylene (C₂H₂) is described by the following reaction:
CzHz + Oz → CO2 + H2O
A. Balance the above equation with the lowest set of whole numbers.
B. If 2.35g C₂H₂ is burned with enough oxygen, how many grams of CO₂ will be formed?
Transcribed Image Text:3. The total volume of seawater is 1.5 x 1021 L. Assume that seawater contains 3.1% NaCl by mass (this means that there are 3.1 g NaCl in 100 g solution) and that its density is 1.03 g/mL, calculate the total mass of NaCl in the seawater in kilograms. Note that 1 kg = 1000 g. 4. Copy the table and fill in the blanks with the appropriate values, symbols and the like: (Note: You can use a periodic table to locate the element.) 5. 6. 7. 8. SYMBOL protons neutrons electrons net charge Which of the following are: (a) SO₂ (b) Sg 5 6 5 Write only the letter of your choice. (c) Cs (d) N₂O5 56 26 A. Molecules but not compounds B. Compounds but not molecules C. Both compounds and molecules Which of the following has more atoms? A. 1.10 g of hydrogen (H) atoms B. 14.7 g of chromium (Cr) atoms 2+ Fe CHEM01-(09-101P) Problem Set No. 1 (e) (f) 0₂ o o Which of the following has a greater mass? A. 2.0 atoms of lead B. 5.1 x 1023 mole lithium 16 18 - 3 79 117 79 (g) CH4 (h) KBr 86 136 0 Write the letter of your choice and support your answer with computations. No solution, no credit. (i) P4 (₁) LiF Calculate the number of C, H and O atoms in 1.50 g of glucose, C6H12O6. There should be 3 answers. page 2 Write the letter of your choice and support your answer with computations. No solution, no credit. 9. Stannous fluoride (SnF₂) is often added to toothpaste as an ingredient to prevent tooth decay. What is the mass of fluorine (in grams) in 24.6 g of the compound? 10. Determine the mass percent composition of each element in calcium silicate CaSiO3. 11. A compound is found to contain 23.3% magnesium, 30.7% sulfur, and 46.0% oxygen. What is the empirical formula of this compound? 12. The complete combustion of acetylene (C₂H₂) is described by the following reaction: CzHz + Oz → CO2 + H2O A. Balance the above equation with the lowest set of whole numbers. B. If 2.35g C₂H₂ is burned with enough oxygen, how many grams of CO₂ will be formed?
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