What is the energy change if 210 g of nahco3 decomposes in the following reaction?

2nahco3 (s) yields na2co3 (s) + h2o (l) +co2 (g) delta h = 85 kj

answers -

53 kj of energy is released by the reaction.

106 kj of energy is absorbed by the reaction.

159 kj of energy is released by the reaction.

212 kj of energy is absorbed by the reaction.

Why do you suppose the structural polysaccharide cellulose does not contain branches? why do you suppose the structural polysaccharide cellulose does not contain branches? branches in the molecule would generate side chains that would almost certainly make it difficult to pack the cellulose molecules into globules, thereby decreasing the flexibility and strength of the globules. branches in the molecule would generate side chains that would almost certainly make it difficult to pack the cellulose molecules into microfibrils, thereby increasing the rigidity and strength of the microfibrils. branches in the molecule would generate side chains that would almost certainly make it difficult to pack the cellulose molecules into globules, thereby increasing the flexibility and strength of the globules. branches in the molecule would generate side chains that would almost certainly make it difficult to pack the cellulose molecules into microfibrils, thereby decreasing the rigidity and strength of the microfibrils.

At 300 mm hg, a gas has a volume of 380 l, what is the volume at standard pressure

Can someone me with 3 and 4 plz. this is for masteries test.