Density (g/cm3) From the plot above, r = ? ? (b) For?=/cm3, r=/100gH2O 150 L m Ile = h g 1000 cm3 g Ile cm3 L g sol 1 kg = kg Ile / h 1000 g (c) The measured solution density is g ILE/cm3 solution at 50oC. For the calculation of Part (b) to be correct, the density would have to be changed to its equivalent at 47oC. Presuming that the dependence of solution density on T is the same as that of pure water, the solution density at 47oC would be higher than g ILE/cm3. The ILE mass flow rate calculated in Part (b) is therefore too low.
I wanted to test my theory so while I was out of the country on assignment I handed the keys to the GLC off for some fuel economy testing. On the EPA’s fuel economy test, our all-wheel-drive equipped GLC300 is rated at 21/28/24 mpg city/highway/combined. We sought to duplicate the EPA’s results with our very own Emissions Analytics team and netted a Real MPG of //. That’s an percent dip on the city cycle, percent increase on the highway cycle, and an overall drop of percent on the combined cycle. Looks like the numbers don’t necessarily back up my theory, but it’s worth noting that our Real MPG tests are all done under a vehicle’s default drive program, which in the GLC300’s case is Comfort mode. We’ll test the GLC again at a later day in Eco mode, which uses tricks such as automatically putting the transmission into neutral while coasting to eke every last mile from each gallon of fuel.