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Peanuts and peanut oil are organic materials and burn in air. Howmany burning peanuts does it take to provide the energy to boil acup of water (250 mL of water)? To solve this problem, we assumeeach peanut, with an average mass of 0.73 g is 49% peanut oil and21% starch; the remainder is non combustible. We further assumepeanut oil is palmitic acid, , with an enthalpy of formation of -848.4kJ/mol. Starch is a long chain of units, each unit having an enthalpyof formation of -960 kJ.
The rate constant (k) for a reaction was measured as a function of temperature. a plot of ln k versus 1/T is line and has a slope of -7445K. Calculate the activation energy for the reaction
When 0.0024 moles of a weak acid are dissolved in enough water to make 0.500 L, the pH of the resulting solution is 5.28. Calculate Ka.
a particular brand of gasoline has a density of 0.737 rm gml. how many grams of this gasoline would fill a 14.4 gal
Calculate the pH of a buffer formed by mixing 85 ml of 0.13 M lactic acid (HL) with 95 ml of 0.15 M NaL (sodium lactate).
What are the concentrations of HSO4-, SO42-, and H+ in a 0.255 M KHSO4 solution? (Hint: H2SO4 is a strong acid; Ka for HSO4- = 1.3 10-2.)
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).
The presence of the carbon-carbon double bond in eugenol can be tested using the bromine water test. write a balance equation for the reaction involved in this test?
A 0.0100 molal aqueous solution of a weak acid freezes at -0.0205 oC. Calculate the percent ionization of the weak acid, HA.
which mixture would not be expected to be homogeneous. pentanol and hexane, KBr and water, acetic acid and methanol, ethylene glycol and water, octane and heptane
A buffer is made up of 355 mL each of 0.200 M NaHCO3 , and 0.134 M Na2CO3 . Assuming that volumes are additive, calculate
Consider the dissolution of magnesium (s) in an aqueous hydrochloric acid solution. What minimum amount of 1.85 M hydrochloric acid is nessecary to produce 28.5 L of hydrogen at STP
Explain What is meant by industrial nitrogen fixation. What is produced during this process
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