Answer to Question #184525 in General Chemistry for bubbles

Question

1. Nitrogen and phosphorus (N and P) are important elements found in fertilizer that encourage health plant growth. As part of an experiment, a student requires some fertilizer for their plants. The student can choose between a 10.0 kg bag of KNO3 or a 12.0 kg bag of LiPO2. Assume N and P help plants grow equally well. 

Calculate the mass % of N and P.

Determine which bag of fertilizer, KNO3 or LiPO2 will support greater plant growth.

Answer 1

For KNO3

MM = 102.1032g/mol

Atomic mass of N = 14.0067 g/mol

% by mass = $\dfrac{14.0067}{101.1032}x100 = 13.87$ %

Mass of N in 10kg of KNO3 = $\dfrac{14.0067}{101.1032}x10kg = 1.385kg$

For LiPO2

MM = 69.9136g/mol

Atomic mass of P = 30.973762g/mol

% by mass = $\dfrac{30.973762}{69.9136}x100 = 44.30$ %

Mass of P in 12kg of LiPO2 = $\dfrac{30.973762}{69.9136}x12kg = 5.316kg$

Conclusion 12kg of LiPO2 contains more of the important nutrient hence will support more growth than 10kg of KNO3