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The compound sucrose is commonly known as table sugar. the chemical formula of sucrose is C12H22O11. How many hydrogen atoms are resent in 1.50 x 10^-4 mol of sucrose?
calculate teh PH of 2.0m NaCN. what is the concentration of HCN in the solution?
What is the specific heat of aluminum if the temperature of a 28.4 g sample of aluminum is increased by 8.1 oC when 207 J of heat is added.
If 4.00 g of the unknown compound contained 0.133 mol of C and 0.267 mol of H, how many moles of oxygen, O, were in the sample?
Calculate the pH of the solution that results from adding 28.0ml of 0.100M NaOH to 50.00 mL of a 0.0500 M solution of hydrochloric acid
Two groups of students prepared the compound acetamide. Group A isolated is a solid with a melting point of 80.5 degrees C. Group B obtained a compound with a melting point of 74-77 degrees C
A buffer is prepared by adding 23.0 g of sodium acetate ( CH3COONa) to 500 ml of a 0.145 M acetic acid ( CH3COOH) solution. A)Determine the ph of the buffer.
An unknown metal sample is subjected to a beam of monochromatic light with a wavelength of 322 nm. Electrons are ejected from the metal surface with a velocity of 5.20 x 105 m/s. What is the threshold frequency of the metal?
approximately what percentage of the acetic acid molecules are protonated and neutral in charge at pH 5.7?
In order to maximize topographic contrast in SEM, would you use backscattered or secondary electron detector? Explain.
A fluid has a density of 4.25 g/mL. If you need to acquire 5.0 g of the fluid, how much volume will you need to draw?
The mechanism by which these compounds kill insects and people is unknown. D. These compounds kill insects and people by stimulating acetylcholinesterase, an enzyme of the nervous system.
The reaction CH3CH2NO2 + OH- → H2O + CH3CHNO2- obeys the rate law d[A]/dt = -k[A][OH-], where A denotes CH3CH2NO2. It takes 0.5 min for one percent of the A to react at 25°C.
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