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1 mol of Br2 contains 6.02 x 1023 molecules (avogadro constant).
In each Br2 molecule there are two Br atoms.
Thus, number of Br atoms = 2 x 2.71 x 6.02 x 1023 = 3.26 x 1024
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How do you convert 271 milliseconds to seconds?
You divide by 1,000. So, 271 milliseconds equals 0.271 seconds.
How many neutrons are in seaborgium?
Seaborgium (106Sg) is a synthetic element whose most stable isotope 271Sg has a half-life of 1.9 minutes. Number of neutrons in Sg-271 is 271-106= 165 neutronsA new isotope 269Sg has a potentially slightly longer half-life (ca. 2.1 min) based on the observation of a single decay. This one (Sg-269) has 269-106= 163 neutrons
Who invented rt-pcr?
It depends if you mean Reverse transcription PCR (RT-PCR) or real time PCR (qPCR) - (there are misnomers often used with real time being (RT)Earliest article I could find on reverse transcription isCoupled reverse transcription-polymerase chain reaction (RT-PCR) as a sensitive and rapid method for isozyme genotyping. Gene, 1990, 93, 271-275 published by Mocharla, H., Mocharla, R., Hodes, M. E.,
Lead levels - blood?
DefinitionBlood lead level is a test that measures the amount of lead in the blood.Alternative NamesBlood lead levelsHow the test is performedBlood is drawn from a vein, usually from the inside of the elbow or the back of the hand. The site is cleaned with germ-killing medicine (antiseptic). The health care provider wraps an elastic band around the upper arm to apply pressure to the area and make the vein swell with blood.Next, the health care provider gently inserts a needle into the vein. The blood collects into an airtight vial or tube attached to the needle. The elastic band is removed from your arm.Once the blood has been collected, the needle is removed, and the puncture site is covered to stop any bleeding.In infants or young children, a sharp tool called a lancet may be used to puncture the skin and make it bleed. The blood collects into a small glass tube called a pipette, or onto a slide or test strip. A bandage may be placed over the area if there is any bleeding.How to prepare for the testNo special preparation is needed.If your child is to have this test performed, it may be helpful to explain how the test will feel, and even demonstrate on a doll. Explain the reason for the test. Knowing the "how and why" may reduce the anxiety your child feels.How the test will feelWhen the needle is inserted to draw blood, you may feel moderate pain, or only a prick or stinging sensation. Afterward, there may be some throbbing.Why the test is performedThis test is used to screen people at risk for lead poisoning, including industrial workers and children who live in urban areas. It is also used to see if treatment for lead poisoning is working.While lead serves no function in our bodies, it is usually found in the body in some amount since it is so common in the environment. Low levels in adults are not thought to be harmful, but in infants and children, low levels of lead can lead to toxicity that may cause deficits in intellectual or cognitive development.See: Lead poisoningNormal ValuesAdults:Less than 20 micrograms/dL of lead in the bloodChildren:Less than 10 micrograms/dL of lead in the bloodNote: dL = deciliterNormal value ranges may vary slightly among different laboratories. Talk to your doctor about the meaning of your specific test results.What abnormal results meanAdults who have been exposed to lead should have blood lead levels below 40 micrograms/dL. Treatment is recommended if you have symptoms of lead poisoning, or if your blood lead level is greater than 60 micrograms/dL.In children, a blood lead level greater than 10 micrograms/dL requires further testing and monitoring. The source of lead must be found and removed. A lead level greater than 45 micrograms/dL in a child's blood usually indicates the need for treatment.What the risks areVeins and arteries vary in size from one patient to another and from one side of the body to the other. Obtaining a blood sample from some people may be more difficult than from others.Other risks associated with having blood drawn are slight but may include:Excessive bleedingFainting or feeling light-headedHematoma (blood accumulating under the skin)Infection (a slight risk any time the skin is broken)ReferencesWoolf AD, Goldman R, Bellinger DC. Update on the clinical management of childhood lead poisoning. Pediatr Clin North Am. 2007;54: 271-294.McGuigan MA. Chronic poisoning: trace metals and others. In: Goldman L, Ausiello D, eds. Cecil Medicine. 23rd ed. Philadelphia, Pa: Saunders Elsevier;2007: chap 20.
A sample of nitrogen gas is confined to a 14.0 L container at 375 torr and 37 degrees Celsius How many moles of nitrogen are in the container?
.271 mol
How many moles are in 1.25 g?
For this you need the atomic (molecular) mass of C6H5OH. Take the number of grams and divide it by the atomic mass. Multiply by one mole for units to cancel. C6H5OH=94.1 grams25.5 grams C6H5OH / (94.1 grams) = .271 moles C6H5OH
How many km is in 271 feet?
271 feet = 0.0826 kilometres
How many kilometers are there in 271 miles?
There are 1.609344 kilometres in one mile. Therefore, 271 miles is equal to 271 x 1.609344 = 436.132224 kilometres.
How many citys in Colorado?
271
How many cities are in Colorado?
271
How many times does 3 go into 271?
271 ÷ 3 = 90.33 times or 90 times with a remainder of 1.
What is 55 percent of 271?
55% of 271 = 55% * 271 = 0.55 * 271 = 149.05
What is 271 plus 271 plus 271?
813
How many pages are in the book The Chocolate War?
271
How many miles from mount airy to Wilmington?
271
How many pages does My Steve have?
My Steve has 271 pages.
