How to calculate significant figures?

The nucleus of an atom of the copper isotope 63Cu contains 29 protons and 34 neutrons. How many electrons must be removed from a neutral 63Cu atom to completely ionize it, leaving only a nucleus

If 4.2 moles of copper metal react with 6.3 moles of silver nitrate, how many moles of silver metal can be formed, and how many moles of the excess reactant will be left over when the reaction is complete?

I have 345 mL of a 1.5 M NaCl solution. If I boil the water until the volume of the solution is 250 mL, what will the molarity of the solution be:?

How are mass and weight different? mass is the space an object takes up and weight is the effect of gravity on mass. mass is the amount of matter and weight is the effect of gravity on mass.

Use the equation to determine what mass of FeS must react to form 326 g of FeCl2. FeS + 2 HCl à H2S + FeCl2

Complete each of the definitions with the appropriate phrase. Precision means that measurements are close to Accuracy means that measurements are close to Anawer Bank each other an accepted value |individual several

Acetylene is hydrogenated to form ethane. the feed to the reactor contains 1.4 mol h2/mol c2h2. (find properties of the reactants/products in appendix of book) a.

Several properties of the element magnesium are shown. Which one is a chemical property?

How does the quantity of atp produced as a result of activity by the electron transport chain compare to the quantity produced as a result of glycolysis?

Molybdenum has a molar mass of 95.94g/mol. How many molecules of molybdenum are in 150.0 g of molybdenum