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A student completed the experiment but found that the total amount of material recovered weighed more than the the original sample. What is most likely source of error and how it may corrected? B) A student found that the mass of the napthalene collected was less than the mass determined by difference. What would account for the smaller amount of napthalene collected? C.) Mothballs in a closet gradually disappear over time. What happens to this material? D.) In 100g. of sweet peas, there are 14.5g carbohydrates, 5.7g sugars, 5.1g dietary fiber, 5.4g protein and 0.4g fat. Calculate the percent composition of these components.
Draw the structure of a compound c5h8o that reacts with phenyl-hydrazine, decolorizes bromine in dichlorometh, and does not give a positive iodoform test
A refrigeration tank holding 5.00 L of Freon gas (C2Cl2F4) at 25°C and 3.00 atm pressure developed a leak. When the leak was discovered and repaired, the tank had lost 76.0 g of the gas.
A student found that her mixture was 15% NH4Cl and 75% SiO2 .Assuming her calculation are correct, what did she most likely do incorrect in her experiment?
Calculate the volume of 8.0g of oxygen gas if it has a temperature of 552 K, and a pressure of 5 atmosheres
What is the procedure for the extractions (to MAXIMIZE THE YIELD) and volumes? (i.e. How much water, NaCl, sodium bicarbonate and in what order)?
how many grams of Cu2S could be produced if 100.0g of copper is heated with 50.0g of sulfur? what is the amount of excess reactant?
Draw four different Lewis electron-dot formulas for the SeO2 molecule. (HINT: One should have two single bonds, two have a single and a double bond, and one two double bonds).
A quantity of ice at 0°C is added to 66.4 g of water in a glass at 55°C. After the ice melted, the temperature of the water in the glass was 15°C. How much ice was added? The heat of fusion of water is 6.01 kJ/mol and the specific heat is 4.18 J/(..
1) Which of these electron configurations has the 4F term symbol for its ground state? p3 d3 d4 f2 f3
How many grams of dry NH_4Cl need to be added to 1.60 L of a 0.700 it M solution of ammonia, NH_3, to prepare a buffer solution that has a pH of 8.62? K_b for ammonia is 1.8 * 10^{-5}.
Following the equation for the combustion of 2C3H6O+8O2----->6CO2+6H2O+853.6 kcal. How much heat will be given off if 0.48 mol of acetone is burned completely?
A 90.0 g piece of hot iron is placed in a calorimeter containing 125 mL water at 19.8 degrees celcius. If the final temperature of both the water and the iron is 24.6 degrees celcius, what is the initial temperature of the hot iron?
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