50 point plz need to show bcl3 + 3 h2o → h3bo3 + 3 hcl; ∆h = –112 kj how much energy is released if four moles of water react? how much energy is released if 14.5 g of hcl is produced? 2hgo → 2 hg + o2; ∆h = +181 kj how many grams of hgo are used when 475 kj is reacted? how many grams of o2 are absorbed when 179 kj is produced? s2cl2 + ccl4 → cs2 + 3 cl2; ∆h = +112 kj how many grams of chlorine are absorbed when 145 kj is produced? if 14.5 g of s2cl2is used, how much energy is produced? caco3 + 2 nh3 → ca(cn)2 + 3 h2o; ∆h = –90.0 kj how many grams of nh3 are used when 798 kj is released? how much energy is released if 19.7 g of water is produced?

(4 mol H2O) x (112 kJ / 3 mol H2O) = 149 kJ 

(14.5 g HCl) / (36.4611 g HCl/mol) x (112 kJ / 3 mol HCl) = 14.9 kJ 

(475 kJ) / (181 kJ / 2 mol HgO) x (216.5894 g HgO/mol) = 1137 g HgO 

(179 kJ) / (181 kJ / 1 mol O2) x (31.99886 g O2/mol) = 31.6 g O2 

(145 kJ) / (112 kJ / 3 mol Cl2) x (70.9064 g Cl2/mol) = 275 g Cl2 

(14.5 g S2Cl2) / (135.0360 g S2Cl2/mol) x (112 kJ / 1 mol S2Cl2) = 12.0 kJ 

CaCO3 + 2 NH3 → CaCN2 + 3 H2O; ∆H = –90.0 kJ 
(798 kJ) / (90.0 kJ / 2 mol HN3) x (17.03056 g NH3/mol) = 302 g NH3 

(19.7 g H2O) / (18.01532 g H2O/mol) x (90.0 kJ / 3 mol H2O) = 32.8 kJ

For cyclohexane compounds drawn in a chair conformation:   -axial bonds are vertical  -equatorial bonds are parallel to two bonds within the ring.  thus, as i assume the chair conformation is drawn:   -the x group is in an axial position, as are the five other vertical bonds.  -three axial bonds are on the top face of the ring  -the other three axial bonds are on the bottom face  the position of the second substituent on each ring carbon is equatorial.  gauche groups must be on an adjacent carbon such as carbon 6 and carbon 2, and also gauche groups are rotated by 60 degrees relative to each other.  drawing the newman projections for c1–c2 and c1–c6 aids in visualizing the groups that are gauche to the y group on c1.  click this link and watch some academic videos that may you more understand the topic