What volume of water must be added to 150 g of 4% NaCl solution to prepare a solution of 0.9%?

calculate how many grams of ammonia can be produced from 4.21 grams of

n2 + 3h2 = 2nh3

my answer:

25.0g n2 x (1 mol/ 28.0gn2) x (2 mol nh3/ 1 mol n2) x (17.0g nh3/ 1 molnh3) = 30.36g n2

25.0g h2 x (1 mol h2/ 2.00g h2) x (2 mol nh3/ 3 mol h2) x (17.0g nh3/ 1 mol nh3) = 141.67g h2

lr = n2

answer by yourhope:

how do models compare to real-world objects?

d. most models represent a real-world object in a simpler way.

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a polar bond is formed when electrons are shared unevenly between atoms