How many hydrogen atoms are in 0.5g water.
Answers
Answer:
First, you need to know the definition of a thing called “mol”. 1 mol of any substance has about 6.023 x 10^23 (Avodrago constant number) atoms. Second, there’s an equation is “m (substance mass) = n (mol) x M (atomic mass). M is depend on what element that substance is formed. Here’s H2O (water), so its M is: 1 (atomic mass of hydrogen) x 2 (there are 2 hydrogen atoms) + 16 (there’s one oxygen atom) = 18. Now we just need to identify “n” through the equation above. So, 0.05g (m) H2O (M=18) has its mol = 0.05 / 18 = … (mol). Then multiply the mol number with Avodrago constant number , you will have the number of atoms in 0.05g H2O
Explanation:
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Answer:
First thing to do is to find no. of moles in 0.05g of HOH
molecular weight of HOH =18 g mol^-1
n = weight of HOH/ molecular weight=0.05/18=2.78*10^-3 mol
Then no. of molecules of HOH in 2.78*10^-3 mol is
No. of molecule= n* Avogadro no.= 2.78*(10^-3) * 6.022*(10^23)=16.74*10^20 molecules of HOH
Now move towards question, its given no. of atom and not no. of molecules. Hence for every molecule of HOH there are three atoms, two of H and one of O.
Hence final answer is 3(16.74)*10^20= 50*10^20=5*10^21
Explanation:
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