<span>All scientists try to base their conclusions on the experiments they have conducted and they have repeated them to be sure of it. </span>
Answer: -
37.5 g of NaCl are in 250 g of a 15.0% (by weight) solution.
Explanation: -
Total mass = 250 g
Percentage of NaCl = 15.0 %
= 
Thus
= 
Number of grams of NaCl present = 
= 37.5 g
B. 1, 2, 1, 2. You balance the equation by making sure there are equal elements on both sides.
Most of the surface of the earth is covered with water and looks blue from space.