Calculate the enthalpy change for the reaction CaCO3(g)→CaO(s)+CO2(g), from the following equations:
2Ca(s)+O2(g)→2CaO(s) ΔH=−1270kJ
2Ca(s)+2C(s)+3O2(g)→2CaCO3(s) ΔH=−2414kJ
C(s)+O2(g)→CO2(g) ΔH=−394kJ

What royal scientist used the 29th day of frozen vapor to encounter elements for mastering new culinary creations?

A100 kmol/h stream that is 97 mole% carbon tetrachloride (ccl4) and 3% carbon disulfide (cs2) is to be recovered from the bottom of a distillation column. the feed to the column is 16 mole% cs2 and 84% ccl4, and 2% of the ccl4 entering the column is contained in the overhead stream leaving the top of the column. calculate the mass and mole fractions of ccl4 in the overhead stream, and determine the molar flow rates of ccl4 and cs2 in the overhead and feed streams. 12. mw_ccla- 153.82; mw_cs2-76.14.

Awhite powder is added to a solution. the images show observations made before the powder is added, just after the powder has been added, and a little while later. (the liquid in the small beaker is phenol red solution.) what evidence shows that a chemical change has taken place?