1. if 71.5% of the compound is calcium, then 100-71.5=28.5% is the second compound. 0.285*56.1 total mass=15.99 grams.
2. Find the atomic mass of each element and multiply by the amount of each element and then add them together.
3. Find the atomic mass of each element and multiply by the amount of each element and then add them together. Then multiply by the number of moles.
4. Find the atomic mass of each element and multiply by the amount of each element and then add them together. After, you use 33 and divide it by the total atomic mass to find the number of moles.
5. percent error=|(experimental-theoretical)|/theoretical = (24.73-25.41)/25.41=0.026.
6. Calculate the number of nitrogen atoms. Cu(No3)2. Multiply N by 2 so there are 2 atoms of nitrogen. Find the atomic mass of each element and multiply by the amount of each element and then add them together. After, divide the total mass of nitrogen (2 atoms*nitrogen atomic mass) by total atomic mass.