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Cinnamic alcohol is used mainly in perfumery, particularly in soaps and cosmetics. Its molecular formula is C9H10O. Calculate the percent composition by mass of C, H, and O in cinnamic alcohol. How many molecules of cinnamic alcohol are contained in a sample of mass 0.469g.
Calculate the free energy change for the following reaction and predict whether the reaction occurs spontaneously at 25 degrees celcius. H2(g)+CO2(g)-->H20(g)+CO(g); ?H=41.8 kJ, ?S=42.1 J/K
NaOH to achieve a phenolphthalein end point. Express the acidity of the wine in terms of grams of tartaric acid (H2C4H4O6, fw 150.09) per 100 mL of wine.
The nuclide As-76 has a half-life of 26.0 hours. If a sample of As-76 weighs 344 g, what mass of As-76 remains after 538 minutes.
If 500 g of KCIO3, decomposes and produces 303 g of KCl, how many grams of O2 are produced?
0.134 mole of KCl and 0.185 mole of CaCl2 were dissolved in water. calculate the total number of moles of Cl- ions in the solution.
The gaseous product of a reaction is collected in a 25.0 L contained at 27 degrees Celsius. The pressure in the container is 216 kPa, and the gas has a mass of 96.0g. What is the molar mass of the gas?
Compute the molar mass of the noble gas krypton(Kr) in a natural sample, which is 2.2% 80 Kr (molar mass 79.91 g/mol),
The temperature of a sample of water increases by 6.5 degrees Celsius when 8.5 kilo Joules are applied. The specific heat of liquid water is 4.18 Joules per gram x degrees Celcius. What is the mass of the sample of water?
you have 19.16 g of CH4 and 22.13 g of O2. How many grams of CO2 would be generated, CH4 + 2 O2 --> CO2 +2 H2O
What was the Ka value calculated by the student if the pH of the solution was 2.60? Express your answer numerically using two significant figures
The mass of a golf ball is 45.9 g. If it leaves the tee with a speed of 78.0 m/s, what is its corresponding wavelength?
2.4 g of a hydrocarbon fuel is burned in a calorimeter that contains 262 grams of water initially at 25.00 C. After the combustion, the temperature is 26.55 C.
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