Barium-142 is used as a GI radiocontrast agent. After 1.25 hours, 9.25 μg remains in the patient. Determine the original dose given the half-life of Ba-142 is 10.6 minutes.

The answer is about 1184 or 1180

A 3.82-g sample of magnesium nitride is reacted with 7.73 g of water. mg3n2 (s) + 3 h2o (â) â 2 nh3 (g) + 3 mgo (s) the yield of mgo is 3.60 g. what is the percent yield in the reaction?

Is elemental sulfur a pure substance

The molecular mass of sodium oxide (Na2O) is A. 61.97894. B. 22.98977. C. 45.97954. D. 38.98917.

What was the difference between Darwin and Lamarck? A. Darwin was able to explain evolution with evidence, something Lamarck did not do. B. The idea of mutation was understood by both but, Darwin could not prove it. C.

Of cesium, cs, hafnium, hf, and gold, au, which element has the smallest atomic radius? explain your answer in terms of trends in the periodic table.

The atomic mass oftitanium is 47.88 atomic mass units This atomic mass represents the 1) total mass of all the protons and neutrons in an atom of Ti 2) total mass of all the protons, neutrons, and electrons in an atom of Ti 3) weighted average mass

How many milliliters of. 45m hcl will neutralize 25ml of 1m koh?

Explain an example of a chemical bond

What is the oxidation number of chlorine

What is a triglyceride? Draw the skeletal structure for a saturated triglyceride whose hydrocarbon tails each contain six carbons.