How many atoms are there in 10.0 g of sodium?

When balancing a chemical equation:

Scientists often have to deal with numbers that are either very large or very small. for example, the radius of the sun is approximately 696,000 kilometers, while bacterial cells are as small as 1.9 × 10-4 millimeters. express each number in an alternate form.

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