MOLE UNIT REVIEW WORKSHEET 1. Convert 500.0 g NaCl to formula units. 5.15 x 1024 f.u. Convert 9.8 x 1024 molecules of C2H6 to grams. 4.9 x 102 g The mass of an unknown gas is 11.59 g. The mass of an equal volume of He is 1.45 g. Calculate the molar mass of the unknown gas. 32.0 g/mol Calculate the percentage composition of sulphur in Al2(SO4)3. 28.11% Calculate the molar mass of Co2(SO4)3•6H2O 514.16 g/mol The empirical formula for a compound is C2H5O and its molecular mass
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the needed amount of Na2CO3 Convert 1.0g of CaCl2-.2H2O to moles of CaCl2-.2H2O 1.0g x 1 mole CaCl2-.2H2O 147.0 g CaCl2-.2H2O = 0.00680 moles CaCl2-.2H2O The mole ratio is 1:1 Hence if we have 0.00680 moles of CaCl2-.2H2O we will as well need 0.00680 moles of Na-2CO3 Convert moles of Na-2CO3 to grams of Na2CO3 = 0.00680 moles Na-2CO3 x 105.99g Na-2CO3 1 mole Na-2CO3 = 0.72g This means that we need 0.72g of Na-2CO3
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Ratio analysis – Shinepukur Ceramics Versus RAK Ceramics Current ratio Shinepukur: From 2009 to 2010‚ current ratio of Shinepukur has increased by 0.24 because of increase in total current assets and decrease in total current liabilities. The increase in total current has occurred for increase in accounts-and-other-receivables‚ advances-deposits-and-prepayments and cash. Among these elements‚ the increase in advances-deposits-and-prepayments is significant (from 82182270 to 278773841). On the
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Chemical Separation Introduction: The objective of this experiment was to extract the pigments from spinach leaves‚ perform Thin Layer Chromatography (TLC) on the spinach leaf extract‚ and then determine the best solvent mixture to use to separate the pigments in the extract. The pigments are located inside the chloroplast walls in the cells of the spinach leaves. In order to obtain the pigments the cell walls must be broken down thus exposing the pigment containing chloroplasts. Upon
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FINANCIAL STATEMENTS Accrual-based approach – revenues are recorded at the point of sale and costs when they are incurred‚ not necessarily when a firm receives or pays out cash Cash flow approach – used by financial professionals to focus attention on current and prospective inflows and outflows of cash 1. Balance sheet a. Assets Cash and Cash Equivalents Marketable securities Accounts receivable Inventories Net property‚ plant and equipment Intangible assets b. Liabilities Accounts
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there are unfortunate couples that can’t have even one. If the woman is pregnant everyone is very excited towards the baby especially the father. But what if the baby in your womb that you thought you has is not actually a real one; but a cluster of H-mole. The fetus or developing baby‚ the placenta (or after-birth)‚ which has many functions including the feeding of the baby and the removal of its waste products. The placenta is made of millions of cells called trophoblasts. These two parts normally
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Accounting and Finance: Managerial Use February 19‚ 2011 Class Project: Ratio Analysis The gross profit percentage is one of several key measurements a company uses in evaluating its financial performance. It helps a company to see what percentage of its earning after costs (for products and/or services) is profit. A higher gross profit percentage is generally preferred as it provides the company with financial resources to pay for research‚ product development‚ and other costs
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Introduction Chemical Kinetics‚ described as the study of rate of chemical processes‚ varies on many factors to determine the time needed for a reaction to complete. The rate of reaction of a chemical reaction is important‚ as reactions are of little use if the time period needed for the reaction to occur is too lengthy. Many factors influence the rate of a chemical reaction‚ such as temperature‚ concentration and surface area. The order of the reaction is based on the concentration of the reactants‚ and
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Ratio Analysis Memo Profitability: Asset turnover and Profit Margin What do the profitability ratios reveal about the financial position of the company? Which users may be interested in each type of ratio? What does the collected data reveal about the performance and position of the company? The profitability ratios measure a company’s operating success for a specific period of time. Most investors and bankers are going to be interested in the profitability of a company. The data for asset
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Name: Marisa Malazzo Date: 7/17/14 Exp 1: Observations of Chemical Changes Lab Section: 76426 Data Tables: Part 1: Chemicals Well No. Observations of the Reaction A. NaHCO3 + HCl no color change‚ some small bubbles formed B. HCl + BTB changed a yellowish orange color‚ no bubbles or precipitation C. NH3 + BTB changed a blue color D. HCl + blue dye changed a green color E. Blue dye + NaOCl no chemical change‚ only blue color appeared with the 1 drop of HCl
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