cernayanci
cernayanci
21-11-2019
Chemistry
contestada
How many atoms are in 0.5 g Helium (He)?
Respuesta :
gaalloo
gaalloo
21-11-2019
Well first you need to know the molar mass of He which is 4.0026g/mol and Avogadro’s number which is 6.022*10^23 (units). So the equation is
0.5gHe * mol/4.0026He *(6.022*10^23)He atoms/mol
=7.5*10^22 He atoms
Round to only one sig fig because 0.5g only has one
Final answer: 8*10^22 He atoms
Answer Link
VER TODAS LAS RESPUESTAS ( 86+ )
Otras preguntas
Three isotopes of oxygen are oxygen-16 oxygen-17 and oxygen-18. Write the symbol for each, including the atomic number and mass number
i need help on my story problems
divers in a competition are scored by an international panel of judges. The highest and the lowest scores are dropped. The total of the remaining scores is mult
How do you know that 35×5=5×35 without finding products
What is the plural form of la television ? A. la televisions b. los televisiones c. las televisiones d. el televisions
Round to the underlined place value 0.9122 the first 2
A water tank holds 24,000 gallons.How many hours will it take for 2/3 of the water to be used if the water is used at an average rate of 650 gallons per day?
For every 13 birds born at the zoo there are two animals born. There were 44 if you were animals born last month then birds so how many animals were born?
what times 13 equals 845
Estimate by rounding each addend to the greatest place: 50,099+ 24,565=74,664 . A is 65,000 , B is 75,000 , C is 70,000, D is 71,000
