Chemistry

What approximate carburization time is needed to achieve 5% atomic carbon at a distance from the surface of 0.4 microns? 1 hour 1.5 hours 2 hours 2.5 hours

What is the potential difference between the anode and the cathode in a voltaic cell? Spontaneous Reaction Cell Potential Electromotive force Voltage 2.5

Which statement would be the most useful for deriving the ideal I gas law? Volume is directly proportional to the number of moles. Volume is inversely proportional to the temperature. Pressure is directly proportional to the volume. Pressure is inversely proportional to the number of moles.

Which type of reaction is represented by the generic equation AB+CDarrow AD+CB combustion decomposition single replacement double replacement

Given the equilibrium constants for the following reactions: 4Cu(s)+O_(2)(g)leftharpoons 2Cu_(2)O(s),K_(1)=6.19 4CuO(s)leftharpoons 2Cu_(2)O(s)+O_(2)(g),K_(2)=0.16 what is K for the system 2Cu(s)+O_(2)(g)leftharpoons 2CuO(s) equivalent to? (Report your answer to four decimal places, i.e.xxxx) square

Question 21 Calculate Delta _(r)G^circ at 25.0^circ C for the reaction below. 2Na(s)+2H_(2)O(l)arrow 2NaOH(aq)+H_(2)(g) Given: Delta _(r)H^circ =-314kJ and Delta _(r)S^circ =-117J/K (Report your answer in units of kJ, to one decimal place, i.e xxx.x, and no units are necessary in the answer.) (Remember to include a negative sign, if necessary.)

What is the pH of a solution made by combining 0.484 m NaC_(2)H_(3)O_(2) with 0.042 M HC_(2)H_(3)O_(2) ? The K_(a) of acetic acid is 1.75times 10^-5 (Report your answer to three decimal places, i.e x.xxx)

What is the molality of ethanol (C_(2)H_(5)OH) in an aqueous solution that is 48.2% ethanol by mass? (Report your answer to two decimal places, i.e xx.xx, and no units are necessary in the answer.)

What is the molality of ethanol (C_(2)H_(5)OH) in an aqueous solution that is 48.2% ethanol by mass? (Report your answer to two decimal places, ite xxxx, and no units are necessary in the answer.)

Consider the reaction of magnesium silicide with water shown below: Mg_(2)Si(s)+4H_(2)O(l)arrow 2Mg(OH)_(2)(aq)+SiH_(4)(g) In the reaction of 13.13 g Mg_(2)Si with excess water, 16.03 g Mg(OH)_(2) were produced. Calculate the percent yield of Mg(OH)_(2) Enter the answer rounded to 2 decimal places.Units are not necessary. Answer: square