Please help Chemistry homework, the teacher doesn't explain anything.?

After the label fell off a bottle containing a clear liquid believed to be benzene, a chemist measured the density of the liquid to verify its identity. A 25.0mL portion of the liquid had a mass of 21.95g. A chemistry handbook lists the density of benzene at 15*C as 0.8787g/mL. A) An experiment requires 16.0g... show more After the label fell off a bottle containing a clear liquid believed to be benzene, a chemist measured the density of the liquid to verify its identity. A 25.0mL portion of the liquid had a mass of 21.95g. A chemistry handbook lists the density of benzene at 15*C as 0.8787g/mL.

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.
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