Calculate the percent by mass of potassium nitrate in a solution made from 45.0 g KNO3 and 295 mL of water at 25 degrees Celsius. At this temperature, the density of water is 0997g/mL. A. 0.0468 M
B. 0.551 M
C. 0.214 M
D. 0.0311 M
E. 0.138 M

Which substances have the lowest melting points: ionic covalent, or metallic

Which statement is true about hcl? (5 points) select one: a. it is a salt because it increases the concentration of metallic ions. b. it is a salt because it is formed by the reaction of an acid and a base. c. it is an acid because it increases the concentration of hydroxyl ions. d. it is an acid because it increases the concentration of hydronium ions.

How many moles is 14.5 cm^3 of platinum? the density of platinum is 21.45 g/cm^3.