i CHAPTER8 Review 181b inside the front cover of this book, calculate the nomber

Question

i CHAPTER8 Review 181b inside the front cover of this book, calculate the nomber of atoms present in each of what mass of hydrogen coetains the same number of atoms as 23, Using the average atomic masses grves 1t. 100g of nitrogen? What mass of cobalt contaies the same sumber of anoms the following samples 150 g of silver, Ag b. 00015 mole of copper,C c. 0.0015 g of copper, Cu d. 200 kg of magnesiom, Mg e. 2.34 ox of calcium Ca T 234 g of calciom, Ca e 2.34 moles of calcium, Ca ofan average sodium atom has a mass of 382×10-13 g, wh s the mass of a magnesium atom in grams? If an average fluorinealomhas a mass of 3.16 × to-258-what l6 is the average mass of a chlorine asom in grams t. Which has the smaller mass, I mole of He atoms or 4 moles of Ik. Which weiphs s. Use the average atomic masses given inside the fromt cover of less, 0.25 mole of sence atoms or 2.0 moles of 24. Using the average atomic masses given inside the front cover of this book, calculabe the indicated quantities the mass in grvas of125 iron atoms h. the nsass in ame of 125 in aom of iron stoms in 125 g of iron this book to calculate the sumber of moles of the element pees ent in each of the following samples a 495 g of ncon b 725 g of nickel c. 115 mg of silver d622 of uranium( is a standard abbreviation meaning the sunber of moles d. the massiu grams of 125 moles of ion G the nomber of iron atom ia 125 g uf iron f the numbes of irou atoms in 125 moles of inos 8-5 Molar Mass Questions e. 135 g of iodine 25. Theof a subsance is the mass (in grams) of 1 mole 3. Use the average atoenic masses given inside the feet cover ef of the substance this book to calculate the nusber of moles of the elemens pres ent in each of the following samples 26. Describe in your own wonds how the miolar mass of the com- pound below may be calculated 2 g of sulfur 11 7.44x10" kg of lead c. 3.27 mg of chlorine 4 4.01 g of lithium É e 1000 g of copper f 82.6 mg of strontium l CH, molocule 21. Use the average atomic masses given inside the front cover of this book to cakculate the mass in grams of each of the follow ng samples 0.251 mole of lithium b. 1.51 moles of aluminum c. 8.75 × 10 2 moles of lead i d 125 moles of chromium e. 425 x 10' moles of iron f. 0000105 mole of magnesium 27. Give the name and caleulate the molar mass for each of the following substances. the f. ANOH) 22. Use the average atomic masses given inside the froot cover of 28. Give the name and calculate the molar mass for following substances a. KHCO d. BeCl this book to cakulate the mass in grams of each of the follom ing samples a 000552 mole of cakium b 625 mmol of boron (I mmolYae mole) t. KCIO, 29. Write the formula and calculate the molar mass for each of the C. 135 moles of aluminum following substances. a. barium chloride b. aluminum nitrate c. iroa(II) chloride d. 1.34 × 10-1 moles of barium e. 279 moles of phosphorus 00000997 mole of arsenic d. sulfur dioxide e. calcium acctate 30. Write the formula and calculate the molar mass for each of the a. barium perchlorate d. copper(Il) nitrate b. magnesium sulfate c. leadIl) chloride e. tin(V) chloride

Explanation / Answer

Remember that 1 mol has 6.022 x 1023 atoms, so you need to match 1 mole of Hydrogen with 1 mole of Nitrogen

You have 7 grams of Nitrogen, with a molecular weight of 14 g/gmol

moles = mass / molecular weight

moles = 7 / 14 = 0.5 moles of nitrogen

we must have the same number of moles of hydrogen to have the same number of atoms, so moles of hydrogen is 0.5 moles of hydrogen

mass = moles * molecular weight

molecular weight of hydrogen is 1 g/gmol

mass (grams) = 0.5 * 1 = 0.5 grams of Hydrogen

7 grams of Nitrogen has the same number of atoms than 0.5 grams of Hydrogen

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