Concept explainers
Calculate each of the following:
a. number of Li atoms in 4.5 mol of Li
b. number of
c. moles of Cu in
d. moles of
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- 3.78 Consider two samples of liquid: I mole of water (H2O) and 1 mole of ethanol. Answer each of the following questions. Note that none of these should require significant calculations. (a) Which sample contains more atoms? (b) Which sample contains more molecules? (c) Which sample has a larger mass?arrow_forwardCalculate the number of atoms of each element present in each of the following samples. l type='a'> 4.2 1 g of water 6.81 g of carbon dioxide 0.000221 g of benzene, C6H6 i>2.26 moles of C12H22O11arrow_forwardCopper(I) iodide (CuI) is often added to table salt as a dietary source of iodine. How many moles of CuI Are contained in 1.00 lb (454 g) of table salt containing 0.0100% CuI by mass?arrow_forward
- itamin B12 , cyancobalamin, is essential for human nutrition. Its molecular formula is C63H88CoN14O14P . A lack of this vita min in the diet can lead to anemia. Cyanocohalamin is the form of the vitamin found in vitamin supplements. l type='a'> What is the molar mass of cyanocobalamin to two decimal places? How many moles of cyanocohalamin molecules are present in 250 mg of cyanocobalamin? What is the mass of 0.60 mole of cyanocobalamin? How many atoms of hydrogen are in 1 .0 mole of cyanocobalamin? What is the mass of 1.0107 molecules of cyanocobalamin? What is the mass (in grams) of one molecule of cyanocobalamin?arrow_forward3. The average atomic mass of an atom is expressed in a. grams c. g/mol b. amu d. moles 4. Which statement is correct? a. 4 g of CH4 is equal to 4 moles of CH4 b. 4 g of CH4 is equal to 1 mole of CH4 C. 4 moles of CH4 is equal to 16 g of CH4 d. 4 moles of CH4 is equal to 64 g of CH4 5. Which statement is NOT true? a. One mole of a substance contains a fixed number of particles. b. One mole each of different substances have different masses and different number of particles. c. One mole each of different substances have the same number of particles but they have different masses. d. The formula mass of the compound is equal to one mole of that substance.arrow_forward3. The average atomic mass of an atom is expressed in c. g/mol a. grams b. amu d. moles 4. Which statement is correct? a. 4 g of CH4 is equal to 4 moles of CH4 b. 4 g of CH4 is equal to 1 mole of CH4 c. 4 moles of CH4 is equal to 16g of CH4 d. 4 moles of CH4 is equal to 64 g of CH4arrow_forward
- What is the empirical formula for the given MF:C5HI12 O a. C5H12 O b. CH O c. CH6arrow_forwardIbuprofen, the anit-inflammatory ingredient in Advil, has the formula C13H18O2. a. How many molecules are in 0.200 mole ibuprofen? b. How many H atoms are in 0.100 mole ibuprofen? c. How many moles of ibuprofen contain 7.4x1025 atoms of C?arrow_forwardA 1.375 g sample of mannitol, a sugar found in seaweed, is burned completely in oxygen to give 1.993 g of carbon dioxide and 0.9519 g of water. The empirical formula of mannitol is Select one: a. CHO b. C3H7O3 c. CH2O d. CH7O3 e. C3H2Oarrow_forward
- A compound has the mass % composition of 49.97 % tungsten, 15.23 % nitrogen, 34.79 % oxygen. What is the empirical formula of this compound? Select one: a. WNO2 b. WN2O6 c. WN2O4 d. WNO e. WN4O12 f. WNO3 g. WN3O9 h. WN4O8 i. none of these j. WN3O6arrow_forward2. Calculate the number of moles and grams from the following: (use correct sig figs in answer) a. 3.510 x 1022 molecules of PCl5 b. 4.386 x 1023 molecules of MgSO43. a. Find the empirical formula of a compound containing 36.89 %C, 13.96 %H, and 49.15 %O. b. Find the molecular formula for the compound with a molar mass of 260.44g/mole.4. Calculate the mass percent of each element in the following chemical formula: C4H11O3N2arrow_forwardA compound that is composed of only carbon and hydrogen contains 85.7% C and 14.3% H by mass. What is the empirical formula of the compound? Select one: a. C4H8 b. C86H14 c. C2H4 d. CH2 e. CH4arrow_forward
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