1) How many atoms are there in 51.3 g of barium chloride(BaCl2)?
2) How many moles of carbon monoxide (CO) are in 29.3 g of thecompound?
3) What is the formula for copper(II) phosphate? Capitalizationand punctuation count?
4) How many atoms of phosphorus are in 2.90 mol of copper(II)phosphate?
5) How many moles of N are in 0.191 g of N2O?
6) A sample of C3H8 has 7.68 × 1024 H atoms. How many carbonatoms does the sample contain? What is the total mass of thesample?
7) Calculate the percent composition by mass of each element inAl(OH)3. Use at least three significant figures.
% Al= ?,  % O=?  ,  % H =?
8) What is the empirical formula of a compound composed of 3.25%hydrogen (H), 19.36% carbon (C), and 77.39% oxygen (O) by mass?
               HCO (Insert subscripts as needed.)
9) A compound with the empirical formula CH2 has a molar mass of98 g/mol. What is the molecular formula for this compound?
