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How many moles of hydrogen are there in
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- An Alka-Seltzer tablet contains 324 mg of aspirin (C.9H8O4,), 1904 mg of NaHCO3, and 1000. mg of citric add (H3C6H5O7). (The last two compounds react with each other to provide the "fizz," bubbles of CO2, when the tablet is put into water.) (a) Calculate the amount (moles) of each substance in the tablet. (b) If you take one tablet, how many molecules of aspirin are you consuming?arrow_forwarderhaps the most important concept in introductory chemistry concerns what a mole of a substance represents. The mole concept will come up again and again in later chapters in this book. What does one mole of a substance represent on a microscopic, atomic basis? What does one mole of a substance represent on a macroscopic, mass basis? Why have chemists defined the mole in this manner?arrow_forward3.47 Calculate the mass in grams of each the following. (a) 2.5 mol of aluminum, (b) 1.25 × 10—3 mol of iron, (c) 0.015 mol of calcium, (d) 653 mol of neonarrow_forward
- ow many molecules of water are there in a 10.0-g sample of water? How many hydrogen atoms are there in this sample?arrow_forwardDetermine the molecular mass of the following compounds:arrow_forwardThe compound 1-propanethiol, which is the eye irritant released when fresh onions are chopped up, has the chemical formula C3HyS and a formula mass of 76.18 amu. What number does y stand for in the chemical formula of the compound?arrow_forward
- Atomic masses are relative masses. What does this mean?arrow_forwardAssume you have 0.123 mol of each of the following compounds. What mass of each is present? (a) C14H10O4, benzoyl peroxide, used in acne medications (b) Dimethylglyoxime, used in the laboratory to test for nickel(II) ions (c) The compound below, responsible for the "skunky" taste in poorly made beer. (d) DEFT, a mosquito repellentarrow_forwardDetermine (a) the number of atoms in 0.185 g of palladium (Pd). (b) the mass of 127 protons of palladium.arrow_forward
- Some brands of salami contain 0.090% sodium benzoate (NaC7H5O2) as a preservative. If you eat 6.00 oz of this salami, how many atoms of sodium will you consume, assuming salami contains no other source of that element?arrow_forwardThe formula mass of an unknown compound containing only C and H is 70.1 amu. What is its molecular formula?arrow_forwardA 4.19-g sample of nitrous oxide (an anesthetic, sometimes called laughing gas) contains 5.73 1022 N2O molecules. How many nitrogen atoms are in this sample? How many nitrogen atoms are in 2.67 g of nitrous oxide?arrow_forward
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