Is there a polyatomic ion in calcium phosphide ?

You are performing an experiment in a lab to attempt a new method of producing pure elements from compounds. the only problem is that you do not know what element will form. by your previous calculations you know that you will have 6.3 moles of product. when it is complete, you weigh it and determine you have 604.4 grams. what element have you produced?

What is the mass defect of a mole of nuclei with 1.8 x 10^15 j/mol binding energy?

If an area has high air pressure and low humidity, what type of weather will it most likely have? plz !