Final answer:
A teenager should intake 61.94 grams of phosphorus in 2 months, as 2 moles of phosphorus equals 61.94 grams. This is based on the molar mass of phosphorus which is 30.97 g/mol.
Step-by-step explanation:
The mass of phosphorus that a teenager should intake can be calculated using the molar mass of phosphorus. One mole of phosphorus has a mass of approximately 30.97 grams. Therefore, to find the mass of 2 moles of phosphorus, we simply multiply the molar mass of phosphorus by two.
Mass of 2 moles of phosphorus = 2 × 30.97 g/mol = 61.94 g
So, a teenager is recommended to intake 61.94 grams of phosphorus in 2 months. This recommendation is based on a regular diet that includes foods rich in phosphorus, such as dairy products, cereals, egg yolk, meat, beans, and nuts.