Exact Numbers

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6 Terms

1
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exact numbers

  • they are not measured quantities

  • they are used in calculations but are ignored when figuring out the final numbers in sigfigs

2
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5 types of numbers that are exact.

  1. percentages

  2. spelled out quantities (ex. Ten Gallons, Three Liters)

  3. Numbers that result from a count (ex. 5 students, 3 decks, 4 atoms)

  4. all constants (ex. pi, universal gas constant, speed of light constant, Avogadro’s number constant.

  5. all definitions (ex. 12in = 1 ft)

Exact numbers are encountered in multiplication and division problems, only used in one occasion with add/sub. (temperature)

3
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V = 4/3(pi)r3

the only part being measured is the r, the rest is a
constant.

4
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k = 670 LmmHg/mol
Pgas = k Cgas

The k is a constant, the Henry’s Law Constant, P
stands for partial pressure, and C stands for
Concentration

5
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kf(m)i = (triangle)Tf

The triangle of Tf is change in temperature, the m stands for molality, the k stands for molality freezing
point constant

6
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II = MRTi
R = 0.082 Latm/molK

The M stands for concentration, R is the universal
gas constant, T stands for temperature (measured) , i stands for particles (exact)