chemistry finding the mass?? 2 questions?

Peter D

New member
A rectangular sheet of lead shielding is placed over the chest of a patient in a dental office while X-rays are taken. the sheet measures 95.0 cm by 45.0 cm by 0.15 cm. If the density of lead is 11.3 g/cm^3, What is the MASS of the lead apron??


2nd question:

calculate the density of a marble that has a mass of 3.050 g and a radius of 0.63 cm. (The volume of a shpere eauals 4pie r^3/3: where pie is 3.14, and r is the radius)

Thanks
 
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