Answer to Question #25826 in Physical Chemistry for jenn

Question

PLEASE HELP WITH THESE 4 QUESTIONS I CAN FIGURE OUT ON MY CHEM HOMEWORK! THANKS!
1) Compute 21405.6 + 9.3456 . Round the answer appropriately.
Express your answer numerically using the proper number of significant figures

2) A graduated cylinder contains 155 of water. A 17.0 piece of iron (density = 7.86 ) and a 24.0 piece of lead are added. What is the new water level in the cylinder?

3) An object has a mass of 3.45 and a volume of 0.1107 . What is the density () of the object?

4)
The specific gravity of iron is 7.87, and the density of water at 4.00 is 1.00 . You can use this information to find the density of iron. Find the volume occupied by 8.00 of iron.
Express your answer to three significant figures and include the appropriate units.