calculate atomic weight of silver which has two isotopes with the following properties : silver-107 (106.91 amu, 51.84% natural occurence) and silver-109 (108.90 amu, 48.16% natural occurence). please help

Look at the reaction below: ca(hco3)2 --> caco3 + co2 + h2o first, balance the reaction. once balanced, use dimensional analysis or another method to find out how many moles of carbon dioxide will be produced if we start with 16.5 moles of calcium bicarbonate (calcium hydrogen carbonate). = mol of co2 number needs to be reported to three significant figures.

This image is an example of a(n) a) atom. b) compound. c) mixture. d) molecule.

Suppose the universe were completely empty except for one object-a solid sphere moving through space of 100 km/s. what sort of path would the object be moving in? explain your answer