If I have 58.4 grams of NaCl, how many molecules do I have?

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• Hey All, i'm pretty good at chemistry, but i can't figure out these problems. Couple you please help me with them. This would help me out a bunch. I usually know how to do these kind of problems. You are given a sample in class of NaCl. The sample weighs 26.3g. Determine how many moles are in the sample In art class you are making a silver bracelet. The amount of silver that you need is 64.8g. How many moles would be in that amount? Moles to Grams You get a plate of 3.41 mol of sulfur. Find the mass (grams) contained in the plate. You decide to make a tin replica of a Tigerr. The replica contains 11.6mol of tin. How many grams does it contain? Multistep Conversions You need 361 grams of table sugar, or sucrose (C12H22O11), to make a cake. How many sucrose molecules will be in the cake? You have 91g of CaCO3. Please determine how many molecules are in the sample? You are given 16g of Iron. Determine the amount of molecules in the sample. Gas Conversions A student fills a 2L flask with SO at standard temperature and pressure. How many molecules of gas are in the flask? There is a test tube with 6L of air. Please determine the amount of molecules that are in the test tube. You are given a balloon with 4L of CO in it. Please determine the amount of molecules in the balloon. Percentage Composition A student is handed a 1 mole sample of CO2. Please determine what percentage of the compound is Carbon and what percent is Oxygen. Thanks in advance Ginger

• Answer:

  You are given a sample in class of NaCl. The sample weighs 26.3g. Determine how many moles are in the sample Number of moles = mass ÷ mass of 1 mole Mass of 1 mole of NaCl = 23 + 35.5 = 58.5 Number of moles = 26.3 ÷ 58.5 In art class you are making a silver bracelet. The amount of silver that you need is 64.8g. How many moles would be in that amount? same as above Moles to Grams Mass = number of moles * mass of 1 mole You get a plate of 3.41 mol of sulfur. Find the mass (grams) contained in the plate. Mass = 3.41 * 32.1 You decide to make a tin replica of a Tigerr. The replica contains 11.6mol of tin. How many grams does it contain? same as above Multistep Conversions Number of molecules = 6.02 * 10^23 * number of moles Number of molecules = 6.02 * 10^23 * (mass ÷ mass of 1 mole) You need 361 grams of table sugar, or sucrose (C12H22O11), to make a cake. How many sucrose molecules will be in the cake? Mass of 1 mole of sucrose = (12 * 12) + (22 * 1) + (11 * 16) = 342 g Number of molecules = 6.02 * 10^23 * (361 ÷ 342) You have 91g of CaCO3. Please determine how many molecules are in the sample? Same as above You are given 16g of Iron. Determine the amount of molecules in the sample. same as above Gas Conversions A student fills a 2L flask with SO at standard temperature and pressure. How many molecules of gas are in the flask? At STP, 1 mole of a gas has a volume of 22.4 liters. Number of moles = number of liters ÷ 22.4 Number of molecules = 6.02 * 10^23 * (number of liters ÷ 22.4) Number of molecules = 6.02 * 10^23 * (2 ÷ 22.4) There is a test tube with 6L of air. Please determine the amount of molecules that are in the test tube. same as above You are given a balloon with 4L of CO in it. Please determine the amount of molecules in the balloon. Same as above Percentage Composition A student is handed a 1 mole sample of CO2. Please determine what percentage of the compound is Carbon and what percent is Oxygen. % C = 100 * (Mass of 1 mole of C) ÷ (Mass of 1 mole of CO2) % O = 100 * (Mass of 1 mole of O) ÷ (Mass of 1 mole of CO2)