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Define when 14.4g of carbon were burned in the presence of 55.1g of oxygen, 16.7g of oxygen remained un-reacted. Explain what mass of carbon dioxide was produced?
A 0.160 g sample of rock was found to have 2.11 × 10-6 mol of potassium-40 (t1/2 = 1.3 × 109 yr) and 2.11 × 10-6 mol of argon-40. How old was the rock? (What assumption is made about the origin of the argon-40?)
The pH of blood is 7.35. It is maintained in part by the buffer system composed of carbonic acid (H2CO3) and the bicarbonate (hydrogen carbonate, HCO3-) ion. What is the ratio of [bicarbonate]/[carbonic acid] at this pH
Why is the temperature 60 instead of 328K?
Consider the following reaction at constant P. Use the information here to determine the value of ?Ssurr at 355 K. Predict whether or not this reaction will be spontaneous at this temperature.
Consider the following reaction: CO + 2H2= CH3OH, kp= 2.26 x 10^2 at 25C . Calculate delta G for the reaction at 25C under each of the following conditions.
Silicon has a FCC structure with unit cell edge of 5.43A and 4 atoms per init cell. a) how many silicon atoms are there in 1cm3 of material b) suppose you dope that 1 cm3 sample of silicon with 1ppm of phosphorus that will increase the conductivit..
A local jeweler purchased large amounts of pure silver because he and his staff wanted to design a new line of Silver jewlery a process which requires the melting and molding of silver into a varieyt of designs
A line in the Balmer series of emission lines of excited H atoms has a wavelength of 410.2 nm. What color is the light emitted in this transition. What quantum levels are involved in this emission line. That is, what are the values of ninitial and..
how much of the CaCl2 can be prepared from 385g of an ore containing Ca(OH)2 if the ore is 78.4% Ca(OH)2 by mass? Use the equation: 2 NH4Cl + 1 Ca(OH)2 --> 2 HN3 + 1 CaCl2 + 2 H20
What product do you get when you perform an aldol synthesis using acetone and para-nitrobenzaldehyde?
What is the pH of the resulting solution when 17.25 mL of 18.00 M HCl is added to a 1.9 liter solution that has 0.74 M cyanide ion CN- and 0.85 M hydrocyanic acid HCN
A molecular compound that obeys the octet rule in which all atoms have a zero formal charge is a) BaCl2 b) BrF3 c) NCl3 d) XeF4
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