Answer:
Knowing that boron has an atomic mass of 10,811 means that all boron isotopes on average weigh 10,811 u.
Explanation:
The atomic mass of an atom is the mass of the atom measured in u (unified atomic mass unit), although we can also express it as Da (Dalton's unit)
Atomic mass refers to the average mass that all isotopes of that element have.
When we speak of isotopes we are referring to the element itself but with a different number of neutrons, which makes it modify its mass number.
Answer:
it is 90 km in one hour it is 90km/h
90/60=1,5
Answer:
1 mole of HCl or NaOH gives you 1 mole of H2O , then the number of moles in H2O is: [ 1÷1×1 ] = 1 mole.
Explanation:
<u>Answer:</u> The number of carbon and oxygen atoms in the given amount of carbon dioxide is 
and 
respectively
<u>Explanation:</u>
To calculate the number of moles, we use the equation:
Given mass of carbon dioxide gas = 3.45 g
Molar mass of carbon dioxide gas = 44 g/mol
Putting values in above equation, we get:
1 mole of carbon dioxide gas contains 1 mole of carbon and 2 moles of oxygen atoms.
According to mole concept:
1 mole of a compound contains 
number of molecules
So, 0.0784 moles of carbon dioxide gas will contain 
number of carbon atoms and 
number of oxygen atoms
Hence, the number of carbon and oxygen atoms in the given amount of carbon dioxide is and respectively
election circles the nucleus
