Multiple Choice
When expressing the number 157 in scientific notation, what is the power of 10 used?
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1. Intro to General Chemistry
Scientific Notation
Multiple Choice
If the equilibrium concentration of CH_4 is 0.00045 mol/L, which of the following correctly expresses this value in scientific notation?
A
4.5 × 10^{-3} mol/L
B
45 × 10^{-4} mol/L
C
4.5 × 10^{-4} mol/L
D
4.5 × 10^{-5} mol/L
Verified step by step guidance1
Identify the given concentration value: 0.00045 mol/L.
Recall that scientific notation expresses numbers as a product of a number between 1 and 10 and a power of 10, i.e., \(a \times 10^{n}\) where \(1 \leq a < 10\) and \(n\) is an integer.
Convert 0.00045 to scientific notation by moving the decimal point to the right of the first non-zero digit. Count how many places the decimal moves to determine the exponent.
Express 0.00045 as \(4.5 \times 10^{-4}\) mol/L because moving the decimal point 4 places to the right converts 0.00045 to 4.5.
Compare this result with the given options to identify the correct scientific notation expression.
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