** Urgent! ** A 8.13-gram sample of NaHCO3 was completely decomposed in an experiment.

2NaHCO3-Na2CO3 + H2CO3

In this experiment, carbon dioxide and water vapors combine to form H2CO3. After decomposition, the Na2CO3 had a mass of 5.27 grams.

1. Determine the mass of the H2CO3 produced.

2. Calculate the percentage yield of H2CO3 for the reaction.

SHOW WORK.
(10 points)

Read these sentences from the text. near the equator, the tropics receive the most rain on a consistent basis. as a result, the fresh water falling into the ocean decrease the salinity of the surface water in that region. [. .] . . as the salt content of sea water increases, so does its density. what can you infer about how rain affects the density of surface water near the equator?

How do scientists think that gravity affected the formation of our solar system?

Calculate the estimated density of each ball. use the formula d = m/v where d is the density, m is the mass, and v is the volume. record your calculations in table a of your student guide. given that the density of water is 1.0 g/cm3, make a prediction about whether each ball will float in water. record your prediction in table a. what is the estimated density of the table tennis ball? record your answer to the nearest hundredth