Question

Lemon juice is a complex solution that does not freeze in a home freezer at temperatures as low as 211°C. At what temperature will the lemon juice freeze if its effective molality is the equivalent of a 10.0 m glucose solution?

Answer 1

(10.0 m) x (1.86 °C/m) = 18.6 °C change
0°C - 18.6 °C = - 18.6 °C

Answer 2

A farmer is planning to raise wheat and barley. Each acre of wheat yields a profit of $50, and each acre of barley yields a profit of $70. To sow the crop, two machines, a tractor and a tiller, are rented. The tractor is available for 110 hours, and the tiller is available for 40 hours. Sowing an acre of barley requires 3 hours of tractor time and 2 hours of tilling. Sowing an acre of wheat requires 4 hours of tractor time and 1 hour of tilling. How many acres of each crop should be planted to maximize the farmer's profit?