How is the density of an irregular object found

How many molecules of sucrose c12h22o11 are there in 454 grams of sucrose

Electric charge is what ? a. kinetic energy b. radiation c. discovery d. electricity

Great amounts of electromagnetic energy from our sun and other bodies in space travel through space. which is a logical conclusion about these electromagnetic waves? their energy must be very their frequency must be very low these waves can travel without a medium they only travel through a vacuum of space