38. Which of the following samples contains the greatest number of atoms? [c] 0.10 mol of...

 

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38. Which of the following samples contains the greatest number of atoms? [c] 0.10 mol of Fe [d] 16 g He [a] 200 g of Pb [b] 3.0 mol of Ar [e] 6.022 × 10²3 0₂ molecules 39. How many moles are in 12.0 g of xenon? [a] 1.00 mol [b] 0.0457 mol [c] 0.183 mol atoms are in 40. How many moles of oxygen [a] 3 mol [b] 3.3 mol [c] 10 mol 41. Ibuprofen, C13H1802, is given in 0.00097 [d] 7.62 x 10³ mol [e] 0.0914 mol 10 moles of KC10;? [d] 30 mol [e] 6.02 x 10¹4 mol mole/tablet dose. How many grams are in one tablet? A) 4.7 x 10-6 g B) 0.20 g C) 1.8 g D) 1.0 x 10³ g 42. Cinnamic alcohol is used mainly in perfumery, particularly in soaps and cosmetics. Its molecular formula is C9H100. Calculate the percentage by mass of hydrogen in cinnamic alcohol. A) 0.753% B) 92.49% C) 11.93% D) 80.56% E) 7.53 % 43. A compound that contains only Se and cl is 52.7% Se by mass. What is the empirical formula of the compound? A) Secl. B) SesC19 C) Secl D) SeC12 E) None of these 38. Which of the following samples contains the greatest number of atoms? [c] 0.10 mol of Fe [d] 16 g He [a] 200 g of Pb [b] 3.0 mol of Ar [e] 6.022 × 10²3 0₂ molecules 39. How many moles are in 12.0 g of xenon? [a] 1.00 mol [b] 0.0457 mol [c] 0.183 mol atoms are in 40. How many moles of oxygen [a] 3 mol [b] 3.3 mol [c] 10 mol 41. Ibuprofen, C13H1802, is given in 0.00097 [d] 7.62 x 10³ mol [e] 0.0914 mol 10 moles of KC10;? [d] 30 mol [e] 6.02 x 10¹4 mol mole/tablet dose. How many grams are in one tablet? A) 4.7 x 10-6 g B) 0.20 g C) 1.8 g D) 1.0 x 10³ g 42. Cinnamic alcohol is used mainly in perfumery, particularly in soaps and cosmetics. Its molecular formula is C9H100. Calculate the percentage by mass of hydrogen in cinnamic alcohol. A) 0.753% B) 92.49% C) 11.93% D) 80.56% E) 7.53 % 43. A compound that contains only Se and cl is 52.7% Se by mass. What is the empirical formula of the compound? A) Secl. B) SesC19 C) Secl D) SeC12 E) None of these

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