Question

12%dolution of urea by weight is diluted by adding 7%urea

Answer 1

Answer:

Look up the atomic weights of the elements in urea and calculate its molecular weight. Doing so gives hydrogen, 1; nitrogen, 14; carbon, 12; and oxygen, 16. Since there are four hydrogen atoms, two nitrogen atoms, one carbon atom and one oxygen atom, the molecular weight of urea calculates as: (4 x 1) + (2 x 14) + 12 + 16 = 60.

Calculate the percentage of nitrogen in urea and look up the definition of molarity. Of urea’s 60 molecular weight, 28 is nitrogen, and the percentage of nitrogen in urea is calculated as: (28 / 60) x 100 percent = 47 percent.

Answer 2

Answer:

Hydrogen, 1; nitrogen, 14; carbon, 12; and oxygen,16. There are four hydrogen atoms, two nitrogen atoms, one carbon atom and one oxygen atom, the molecular weight of urea calculates as:(4×1)+(2×14)+12+16=60.

Explanation:

Calculate the percentage of nitrogen in urea and look up the definition of molarity. Of urea's 60 molecular weight, 28 is nitrogen, and ye percentage of nitrogen in urea is calculated as:(28/60)×100 percent =47 percent.