Pheromones are a special type of compound secreted by the females of many insect species to attract the males for mating. One pheromone has the molecular formula C19H38O. Normally, the amount of this pheromone secreted by a female insect is about 1.0 x 10-­12 g. How many molecules are there in this quantity? State your answer in standard form. (Avogadro's constant = 6.02 x 1023 mol-1) (Ar: C = 12, H = 1, O = 16)