Use the following information on Cr to determine the amount of heat required to convert 159.6 g of solid Cr at 1760°C into liquid Cr at 2060°C. melting point = 1860°C; boiling point = 2672°C ΔHfus = 20.5 kJ/mol; ΔHvap = 339 kJ/mol; c(solid) = 44.8 J/g°C; c(liquid) = 0.94 J/g°C Enter your answer in units of kJ to three significant figures.

793 kJ

Explanation:

Given that :

Then; the heat needed to convert solid from is calculated as:

Also;

Now; the heat required to convert solid to liquid at is;

= 3.069 × 20500

= 62914.5 J

Also ; given that :

Then the heat needed to convert liquid from to is;

∴ The total heat required =

= (715008 + 62914.5 + 15002.4) J

= 792924.9 J

= 793 kJ

the ratio of the conjugate base to the acid required to attain the desired ph.