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A skydiver weighing lb (including equipment) falls vertically downward from an altitude of ft and opens the parachute after s of free fall. Assume that the force of air resistance is when the parach
The canister is placed in an oven until all the has boiled off and the canister is empty. How much energy in calories was absorbed?
An ethylene glycol solution contain 21.2g ethylene glycol (C2H6O2) in 85.4ml of water. Compute the freezing point and boiling point of the solution. (Assume the density of the water was 1.00g/ml
Is it safe to assume that if they are both R- or both S- that they are identical? or is it possible for both to be R but still be chiral?
Calculate the pH of the solute in an aque- ous solution of 0.611 M NH3(aq) if the Kb is 1.8 × 10-5. What is the percentage protonation of the solute? Answer in units of % & ;
The oxide of 'N' element contains 33.33% of the element .The same element forms a chloride whose Vapour density is 59.25. Calculate equivalent weight , atomic weight and valency of the element ?
If 1.3g of sodium reacted with 1.8g of water what would be the total mass of sodium hydroxide and hydrogen produced?
By combining your answers in A and B, and using average bond enthalpies for C-H, calculate average bond enthalpies of the carbon-carbon bonds in C6H6(g).
A 29.0-g sample of water at 260. K is mixed with 48.0 g water at 340. K. Calculate the final temperature of the mixture assuming no heat loss to the surroundings.
A molecule of ammonia, NH3, and a molecule of methane, CH4, each have 4 electron domains. Draw or describe the Lewis dot structures for each of these molecules.
Draw the structure of the bromohydrin formed when (E)-2-hexene reacts with Br2/H2O. Draw each stereoisomer as a separate structure, using wedge and dash bonds to indicate stereochemistry.
The background LSC vial gave 1.2 cpm. Calculate the 239Pu concentration in molarity, and the associated uncertainty. Assume 100% efficiency for LSC, and (+ or -)0.5mL as the micropipette uncertainty
Pervaporation is used to produce nearly pure ethanol from a feed with 90 percent ethanol and 10 percent water. the feed enters at 80C, and the design calls for reheating the liquid after the tempera
Calculate the volume of 1M HCIO4 needed to lower the ph to 2.5; for a sample starting at ph 4, 7, and 10. Considering that there are 83 samples, about how much HCIO4 shoud you bring to the lab?
how many grams of cuso4 are there in 219 grams of an aqeous solution that is 20.2% by weight cuso4?
Which of the following statements is incorrect regarding a 320 g sample of gaseous sulfur dioxide at 0 °C and 760 mmHg pressure?
Peonin is a red pigment found in the petals of peony flowers why do you think peonin is bonded to two hexoses?what monosaccharides would be produced by acid-catalyzed hydrolysis of peonin ?
Titrating this sample with a 0.005M NaOh required 7.3mL of NaOH solution to reach the endpoint. What is the pH of the lake?
What is the osmotic pressure, in atm, of a solution formed by dissolving 13.2 g of Al2(SO4)3 in 0.387 L of water at 34.1 oC? (R = 0.0821 L-atm/mol-K; 0 oC = 273 K)
Draw the two elimination products that could be formed by the reaction of 2-bromo-2-methylbutane with potassium hydroxide in ethanol at 78oC.
compound 1-iodododecane is a nonvolatile liquid with a density of 1.20g/ml. the density of mercury is 13.6g/ml. what do you predict for the height of a barometer column based on 1-iodododecane,when
Choose the two alkyl bromides and the hydrogenation method that must be used to synthesize these alkenes from acetylene.
The mass percent composition of the compound is 53.31% C, 11.19% H, and the rest is O. What is the molecular formula of the compound?
The heat of vaporization of water at 100 °C is 40.66 kJ/mol. Calculate the quantity of heat that is absorbed/released when 9.00 g of steam condenses to liquid water at 100 °C.
The Henry's Law constant for carbon dioxide gas in water at 25 oC is 0.031 mol/L-atm. Calculate the solubility of carbon dioxide in water at 25 oC in moles/L if the partial pressure of carbon dioxid