67.00 grams of calcium carbonate breaks down. a. write the balanced the reaction b. identify the reaction type (single replacement, double replacement, synthesis, decomposition or combustion). c. what is the theoretical yield of carbon dioxide gas (in grams)? d. what is the percent yield if 27.67 grams of carbon dioxide gas are actually produced?

A. CaCO₃(s) → CaO(s) + CO₂(g).

B. Decomposition reaction.

C. 29.46 g.

D. 93.94%

Explanation:

A. Write the balanced the reaction

CaCO₃(s) → CaO(s) + CO₂(g),

1.0 mol of CaCO₃ is decomposed to produce 1.0 mol of CaO and 1.0 mol of CO₂.

B. Identify the reaction type (single replacement, double replacement, synthesis, decomposition or combustion).

A decomposition reaction is a type of chemical reaction in which a single compound breaks down into two or more elements or new compounds.

Herein, CaCO₃ is decomposed to produce CaO and CO₂.

C. What is the theoretical yield of carbon dioxide gas (in grams)?

n = mass/molar mass = (67.0 g)/(100.08 g/mol) = 0.6695 mol.

Using cross-multiplication:

1.0 mol of CaCO₃ produces → 1.0 mol of CO₂, from stichiometry.

∴ 0.6695 mol of CaCO₃ produces → 0.6695 mol of CO₂.

∴ The theoretical yield of carbon dioxide gas = n*molar mass = (0.6695 mol)(44.0 g/mol) = 29.46 g.

D. What is the percent yield if 27.67 grams of carbon dioxide gas are actually produced?

∵ the percent yield = (actual yield/theoretical yield)*100.

actual yield = 27.67 g, theoretical yield = 29.46 g.

∴ the percent yield = (27.67 g/29.46 g)*100 = 93.94%.

2b2t

explanation:

2b2t

it can be observed without changing the identity of the object.

it depends on what substance you're talking about as well as many other factors. in quantum mechanics, the observation of particles affects the observers ability to measure certain properties. for example: you can know the velocity of a particle, but you can't know it's position; or you can know it's position, but not it's velocity. it's like trying to find out where a grain of sand is by throwing other grains of sand at it. once you find out where it is, it's been moved. it's also like trying to find an answer to the question of whether or not a tree falling in a forest makes a sound if nobody is there to hear it. paradoxically, the only way to find out is to be there and hear it.