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The Average Speed of Oxygen Molecules at 570°C Is 1

Question 68

Multiple Choice

The average speed of oxygen molecules at 570°C is 1.49 × 105 cm/s. Which of the following calculations would convert this speed to units of miles per hour?


A) 1 s1.49×105×2.54 cm1in×1ft12in×1mi5280ft×3600 s1 h\frac { 1 \mathrm {~s} } { 1.49 \times 10 ^ { 5 } } \times \frac { 2.54 \mathrm {~cm} } { 1 \mathrm { in } } \times \frac { 1 \mathrm { ft } } { 12 \mathrm { in } } \times \frac { 1 \mathrm { mi } } { 5280 \mathrm { ft } } \times \frac { 3600 \mathrm {~s} } { 1 \mathrm {~h} }
B) 1.49×1051 s×1in2.54 cm×12in1ft×5280ft1mi×1 h3600 s\frac { 1.49 \times 10 ^ { 5 } } { 1 \mathrm {~s} } \times \frac { 1 \mathrm { in } } { 2.54 \mathrm {~cm} } \times \frac { 12 \mathrm { in } } { 1 \mathrm { ft } } \times \frac { 5280 \mathrm { ft } } { 1 \mathrm { mi } } \times \frac { 1 \mathrm {~h} } { 3600 \mathrm {~s} }
C) 1.49×1051 s×1in2.54 cm×1ft12in×1mi5280ft×3600 s1 h\frac { 1.49 \times 10 ^ { 5 } } { 1 \mathrm {~s} } \times \frac { 1 \mathrm { in } } { 2.54 \mathrm {~cm} } \times \frac { 1 \mathrm { ft } } { 12 \mathrm { in } } \times \frac { 1 \mathrm { mi } } { 5280 \mathrm { ft } } \times \frac { 3600 \mathrm {~s} } { 1 \mathrm {~h} }
D) 1.49×1051 s×2.54 cm1in×12in1ft×5280ft1mi×3600 s1 h\frac { 1.49 \times 10 ^ { 5 } } { 1 \mathrm {~s} } \times \frac { 2.54 \mathrm {~cm} } { 1 \mathrm { in } } \times \frac { 12 \mathrm { in } } { 1 \mathrm { ft } } \times \frac { 5280 \mathrm { ft } } { 1 \mathrm { mi } } \times \frac { 3600 \mathrm {~s} } { 1 \mathrm {~h} }
E) 1 s1.49×105×2.54 cm1in×12in1ft×5280ft1mi×1 h3600 s\frac { 1 \mathrm {~s} } { 1.49 \times 10 ^ { 5 } } \times \frac { 2.54 \mathrm {~cm} } { 1 \mathrm { in } } \times \frac { 12 \mathrm { in } } { 1 \mathrm { ft } } \times \frac { 5280 \mathrm { ft } } { 1 \mathrm { mi } } \times \frac { 1 \mathrm {~h} } { 3600 \mathrm {~s} }

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