What mass of copper is required to replace silver from 4.00g of silver nitrate dissolved in water

The big bang nucleosynthesis theory states that elements were produced in the first few minutes of the big bang while elements have their origins in the interiors of stars, forming much later in the history of the universe.

What does a numerical subscript following an element in a chemical formula mean?

Use the periodic table to determine how many grams of oxygen would be required to react completely with 859.0 g c2h2