you have a 500g block of butter at home. You found out that its volume its 555l. What is the density of the butter?

Which of the following statements is true about planck’s law

Find the number of grams of hcl needed to react completely with .50 moles of magnesium.

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