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.

106 kJ of energy is absorbed by the reaction.

Explanation:

From the reaction, when two moles of NaHCO3 are decomposed an energy of 85 kJ are absorbed.

But, molar mass of NaHCO3 is 84 g/mol

Therefore;

2 × 84 g = 168 g absorbed 85 kJ

Thus; a mass of 210 g of NaHCO3 will absorb an energy of;

= (210/168) × 85

= 106.25 kJ

= 106 kJ of energy is absorbed in the reaction.

a small container that holds a source of energy a solar cell that captures light energy and converts it into electricity a voltaic cell that uses the oxidation of a fuel to produce electricity

explanation:

the correct answer is b. a strong acid completely dissociates to its ions when dissolved in water. completely dissociates to and ions. a is incorrect because does not fully ionize to and ions and some remain as the compound . c and d are incorrect because, and do not fall into the category of bronsted lowry acids. a bronsted lowry acid is a proton donor and since both molecules do not have a proton to donate they are not bronsted lowry acids. likewise,   if we use the lewis acid definition, they cannot be acids. a lewis acid is an electron pair acceptor. both and have a complete octet so can not accept any electrons which disqualifies them as acids.