an object displaces 32 mL of water and a known density of 0.0625 g/mL. What is the mass of the object?

Two friends at different locations want to communicate with each other by sending low energy signals. which of the following methods can they use to communicate? a) produce x-rays using colliding electrons and send them to radios, which capture sound b) send messages using infrared radiation, which travel in the form of waves c) send radio waves through intervening media like radio and television d) produce sound waves using microwaves from heated objects

In salt water solution,the salt is the blank

How many atoms or molecules are there in a mole of a substance?