A cobalt block was heated in a calorimeter to increase its temperature by 41.5 °C. The energy produced by the experiment was 1,850 J. What was the mass of the cobalt block? Specific Heat (CCo =0.117 J/g ° C)

At the start of a trip, the odometer on a car read 21,395. At the end of the trip, 13.5 hours later, the odometer read 22,125, Assume the scale on the odometer is in miles. What is the average speed the car traveled during this trip?

If 2.57 mol of ethane (Call) undergo com- bustion according to the unbalanced equation C2H6 +02 CO₂+H₂O, how many moles of O2 is required? Answer in units of mol.

The amount of protein in a sample is measured by the samples absorbance of light at a given wavelength. Using standards, a best fit line of absorbance vs. mg protein gave the following parameters:                                     m = 0.01630    sm = 0.00022                                                             b = 0.1040                                sb = 0.0026 An unknown sample has an absorbance of 0.246 ± 0.0059. What is the amount of protein in the sample?