Please help Chemistry homework, the teacher doesn't explain anything.?
A) An experiment requires 16.0g of cyclohexane, whose density at 25*C is 0.7781g/mL. What volume of cyclohexane should be used?
B) A spherical ball of lead had a diameter of 4.0cm. What is the mass of the sphere if the lead has a density of 11.34g/ccm? (The volume of a sphere is (4/3)pi r cubed, where r is the radius.)
Can you please show your work so that I can understand, thank you.