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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EP BASIC CHEMISTRY-STANDALONE ACCESS
- 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_forwardA single molecule of a certain compound has a mass of 3.4 x10-22g. Which value comes closet to the mass mass of a mole of thi compoumd? Choice A 50 g.mol-1 B 100 g.mol-1 C 150 g.mol-1 D180 g.mol-1arrow_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
- An organic compound has the following composition: 69.72% carbon, 11.70% hydrogen and 18.58% oxygen. What is its empirical formula? Select one: a. C5H1002 b. C5H100 O c. C4H1202 d. C6H6O2 e. C10H502arrow_forwardWhat is the empirical formula for the given MF:C5HI12 O a. C5H12 O b. CH O c. CH6arrow_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
- 10. What does Avogadro's number represent? a. the number of atoms in 1 mol of an element b. the number of molecules in 1 mol of a compound c. the number of Na* ions in 1 mol of NaClag) d. all of the above 11. 6.022 x 1023 atoms of nickel is equivalent to c. 58.69 g Nickel d. All of the above a. 1 mole of Nickel atoms b. 58.69 amu Nickel 12. How many atoms of lead are there in 2 moles of lead? a. 6.022 x 1023 Pb atoms c. 1.2044 x 1024 Pb atoms b. 6.022 x 1024 Pb atoms d. All of the abovearrow_forwardNeed help solving questions 4a, 4b, and 4c? Thanks!arrow_forwardQuestion 1: Select the best answer for the following questions? 1. Number of ions in 0.5 mole of Hg2Cl2 is equal to: A. 1.2x1024 B. 9.3x1023 C. 3.01x1023 D. 6.02 x1023 2. Mass of one sodium atom equal: A. 23 amu В. 3.8 х1023 С. 3.8 х1023 D. A and C are true 3. The density of chemical substances is classified as property: А. Intensive B. Extensive physical C. Chemical D. Intensive and chemical physical 4. When AGNO3 dissolved in water is an example on А. Chemical B. Physical Property C. Physical Change D. Chemical Property Change 5. Describe the accuracy and precision of the image: A. Accurate and B. Precise and not C. Accurate and D. Not accurate neither accurate. Precise. precise. not Precise. 6. Which is the product of these numbers, to the appropriate number of significant digits? (013.012 X 21.30) + (32. 15 – 25.063) 7.12 A.45.49 В.46.0 C.45.5 D. 46.01 7. Which of the structures shown below represent isotopes? 235 238 Y 234 234 w 92 92 93 92 A. Z and W B. X and Y C. X and Z D. X, Y…arrow_forward
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