# CHM 1045 Reactions and Stoichiometry In Class Questions 2. How many sodium atoms are in 0.120...

###### Question:

CHM 1045 Reactions and Stoichiometry In Class Questions 2. How many sodium atoms are in 0.120 moi Na? 0.10 moi va y...olx.2-12 ima 2. Calculate the number of atoms in 2.95 mol Of copper. 2.45 voleux 3. A Sliver ring contains 1.1 X 10 silver atoms. How many moles of silver are in the ring? Itxite Imol- * 6.024x15 - 4. Zinc (Zn) is a siivery metal that is used in making brass (with copper) and in plating Iron to prevent corrosion. How many grams of Zn are in 0.356 mole of Zn? 0.356 molen x 65399 22-23.3 azn 5. How many atoms are in 19.72 g Of Sulfur? 19.7295 x mel. x Sul - 3.10.2015 32.060 ind 6. What is the mass din grams) of 3.29 x 10" atoms Ag? 3. 29x109 atons, I made alors 7. What is the mass of 1.33 moles of titanium, Ti? 8. Calculate the moles of sulfur in 57.8 g of sulfur. 9. What is the mass of 2.55 x 102 atoms of lead? 10. How many O, molecules are present in 0.470 g of oxygen gas? 11. Calculate the molecular masses in amu) of the following compounds: a. sulfur dioxide (SO2), a gas that is responsible for acid rain b. caffeine (C.H.N.O), a stimulant present in tea, coffee, and cola beverages 12. How many moles of CH4 are present in 6.07 g of CH4? 13. How many hydrogen atoms are present in 25.6 g of urea ((NH2).CO), which is used as a fertilizer, in animal feed, and in the manufacture of polymers? The molar mass of urea is 60.06 g.

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