Concept explainers
How many oxygen atoms are in each chemical formula?
a.
b.
c.
d.
How many hydrogen atoms are in each of the formula in Question 35?
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Masteringchemistry With Pearson Etext -- Valuepack Access Card -- For Introductory Chemistry
- You have a pure sample of the antiseptic aminacrine, C13H10N2. Calculate the mass in grams of 0.06500 mol aminacrine. Calculate the number of aminacrine molecules in a 0.2480-g sample. Calculate the number of nitrogen atoms in this 0.2480-g sample. Calculate the mass of N in 100. g aminacrine.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_forwardUse the average atomic masses given inside the front cover of this hook to calculate the number of moles of the element present in each of the following samples. l type='a'> 49.2 g of sulfur 7.44104 kg of lead 3.27 mg of chlorine 4.01 g of lithium l00.Ogofcopper 82.6 mg of strontiumarrow_forward
- Diamond is one form of elemental carbon. An engagement ring contains a diamond weighing 1.25 carats (1 carat = 200 mg). How many atoms are present in the diamond?arrow_forwardComplete the following table. l> Mass of Sample Moles of Sample Atoms in Sample 5.00 g AI td> 0.00250 mol Fe td> msp;2.61024 atoms Cu 0.00250 g Mg td> msp;2.7103 mol Na msp;1.00104 atoms Uarrow_forwardWhat number of molecules (or formula units) are present in 1.00 g of each of the compounds in Exercise 52?arrow_forward
- Using the average atomic masses given inside the front cover of this book, calculate the number of atoms present in each of the following samples. l type='a'> 1.50 g of silver, Ag 0.0015 moIe of copper, Cu 0.0015 g of copper, Cu 2.00 kg of magnesium, Mg 2.34 oz of calcium, Ca 2.34 g of calcium, Ca 2.34 moles of calcium, Caarrow_forwardCalculate the molar mass of each hydrated compound. Note that the water of hydration is included in the molar mass. (See page 85.) (a) Ni(NO3)2 6 H2O (b) CuSO4 5 H2Oarrow_forwardUse the periodic table shown in Fig. 4.9 to determine the atomic mass (per mole) or molar mass of each of the substances in column 1, and find that mass in column 2. l> Column 1 Column 2 (1) molybdenum (a) 33.99 g (2) lanthanum (b) 79.9 g (3) carbon tetrabromide (c) 95.94 g (4) mercury(II)oxide (d) l25.4g (5) titanium(iV) oxide (e) 138.9 g (6) manganese(ll) chloride (f) 143.1 g (7) phosphine, (g) 156.7 g (8) tin(II) fluoride (h) 216.6 g (9) lead(II) sulfide (i) 239.3 g (10) copper(I)oxide (j) 3316garrow_forward
- Gypsum is hydrated calcium sulfate. A 4.89-g sample of this hydrate was heated. After the water was removed, 3.87 g anhydrous calcium sulfate remained. Determine the formula for this hydrate and name the compound.arrow_forwardIn chemistry, what is meant by the term mole? What is the importance of the mole concept?arrow_forwardNitric acid is composed of HNO3 molecules. A sample weighing 4.50 g contains 4.30 1022 HNO3 molecules. How many nitrogen atoms are in this sample? How many oxygen atoms are in 61.0 g of nitric acid?arrow_forward
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