7.The average speed of helium at 25°C is 1255 m/s. Convert this speed to miles per hour (mph). (4 points)
8.How many minutes does it take light from the sun to reach Earth? (The distance
9.Normal body temperature is 78.0°F. Calculate this temperature in degrees Celsius and Kelvin. (4 points)
10. Bromine is a reddish-brown liquid. Calculate its density (in g/mL) if 586 g of the substance occupies 188 mL. (4 points)
11. Aluminum is a lightweight metal (density = 2.70 g/cm3) used in aircraft construction, high-voltage transmission lines, beverage cans, and foils. What is its density in kg/m3? (4 points)
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