A group of students in 4th block measured the classroom door width. They got a measurement of 3.25 feet. The actual width is 3.40 feet. What is the % error?

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.

Mercury metal is poured into a graduated cylinder that holds exactly 22.5 ml the mercury used to fill the cylinder mass in 306.0 g from this information calculate the density of mercury

All of the following are homogeneous mixtures except a) sugar dissolved in water. b) orange juice. c) coffee with cream. d) household vinegar. e) apple juice