Given the following equilibria, Ni2+(aq) + 2 OH–(aq) Ni(OH)2(s) K1 = 1.8 × 1015 Ni2+(aq) + 4 CN–(aq) Ni(CN)42–(aq) K2 = 2.0 × 1031   determine the equilibrium constant, Kc, for the following reaction.  Kc = ?Ni(OH)2(s) + 4 CN–(aq) Ni(CN)42–(aq) + 2 OH–(aq)This problem requires calculations submitted on scratch paper.

At a given temperature, K = 0.024 for the equilibrium:PCl5(g)    PCl3(g) + Cl2(g)What is K for:Cl2(g) + PCl3(g)    PCl5(g)?This problem requires calculations on submitted scratch paper.Hint: Determine mathematical relationship of both chemical equations to determine new value of K

A particular gas exerts a pressure of 3.38 bar. What is this pressure in units of atmospheres? (1 atm = 760 mm Hg = 101.3 kPa = 1.013 bar)Show Required Work

A gas sample is held at constant pressure. The gas occupies 3.62 L of volume when the temperature is 21.6°C. Determine the temperature at which the volume of the gas is 3.40 L.Show Required Work

A concentrated phosphoric acid solution is 85.5% H3PO4 by mass and has a density of 1.69 g/mL at 25°C. What is the molarity of H3PO4?Show Required Work

Aqueous hydrochloric acid reacts with magnesium to produce hydrogen gas according to the balanced equation below.2 HCl(aq) + Mg(s) → MgCl2(aq) + H2(g)If 250.0 mL of 3.00 M HCl is combined with 9.92 g Mg, what volume of hydrogen gas can be produced? Assume the temperature and pressure of the gas are 25 °C and 0.988 atm, respectively. (R = 0.08206 L⋅atm/mol⋅K)Show Required Work

There are 5 engineering male students and 2 engineering female students standing together in a line to have photos taken. If the two female students must be at both ends of the line, how many different ways of orders can they follow when taking photos ?

You draw a single card from a standard, shuffled deck of 52 cards. You want to find the probability of drawing a Heart and a King. (Decimal number is required; three decimal digits are preferred.)

It is an identity

Given the scatter plot below, what conclusion can you make about correlation coefficient r of bivariate data?