![subject](/tpl/images/cats/himiya.png)
Chemistry, 30.07.2019 02:30 henriquetucker
How many protons, neutrons, and electrons are there in a neutral atom of 131i (iodine-131)?
![ansver](/tpl/images/cats/User.png)
Answers: 1
![](/tpl/images/ask_question.png)
![](/tpl/images/ask_question_mob.png)
Another question on Chemistry
![question](/tpl/images/cats/himiya.png)
Chemistry, 21.06.2019 16:00
What is the molality of a solution that has 4 mol of kci in 0.800 kg of water
Answers: 3
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 05:30
A3.37-mg sample of protein was chemically digested to convert its nitrogen into ammonia and then diluted to 100.0 ml. then 10.0 ml of this solution was placed in a 50-ml volumetric flask and treated with 5 ml of phenol solution plus 2 ml of sodium hypochlorite solution. the sample was diluted to 50.0 ml, and the absorbance at 625 nm was measured in a 1.00-cm cuvette and found to be 0.486. for reference, a standard solution was prepared from 10.0 mg of nh4cl (molar mass = 53.49 grams/mole) dissolved in 1.00 l of water. then 10.0 ml of this standard was placed in a 50-ml volumetric flask, treated in the same manner as the unknown, and the absorbance found to be 0.323. finally, a reagent blank was prepared using distilled water in place of unknown, it was treated in the same manner as the unknown, and the absorbance found to be 0.076. calculate the weight percent of nitrogen in the protein.
Answers: 1
![question](/tpl/images/cats/himiya.png)
Chemistry, 22.06.2019 06:30
The following reaction shows sodium carbonate reacting with calcium hydroxide. na2co3 + ca(oh)2 → naoh + caco3 how many grams of naoh are produced from 20.0 grams of na2co3? (molar mass of na = 22.989 g/mol, c = 12.01 g/mol, o = 15.999 g/mol, ca = 40.078 g/mol, h = 1.008 g/mol) 12.2 grams 15.1 grams 24.4 grams 30.2 grams
Answers: 2
![question](/tpl/images/cats/himiya.png)
You know the right answer?
How many protons, neutrons, and electrons are there in a neutral atom of 131i (iodine-131)?...
Questions
![question](/tpl/images/cats/mat.png)
Mathematics, 17.12.2021 08:40
![question](/tpl/images/cats/health.png)
Health, 17.12.2021 08:40
![question](/tpl/images/cats/en.png)
English, 17.12.2021 08:40
![question](/tpl/images/cats/en.png)
English, 17.12.2021 08:40
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/istoriya.png)
History, 17.12.2021 08:50
![question](/tpl/images/cats/mat.png)
Mathematics, 17.12.2021 08:50
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/istoriya.png)
History, 17.12.2021 08:50
![question](/tpl/images/cats/geografiya.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/en.png)
English, 17.12.2021 08:50
![question](/tpl/images/cats/en.png)
![question](/tpl/images/cats/istoriya.png)
![question](/tpl/images/cats/mat.png)
![question](/tpl/images/cats/biologiya.png)
Biology, 17.12.2021 08:50
![question](/tpl/images/cats/en.png)