What is the average salinity of ocean water 1. 0.345 g/kg 2. 3.45 g/kg 3. 34.5 g/ml 4. 345 g/ml?
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3.00097 x atoms are contained in 100.0 g of mercury.
The mole is defined as the amount of substance that contains as many elementary entities as there are atoms in exactly 12 g of carbon-12.”
Number of moles of mercury =
Number of moles of mercury =
= 0.4985 moles
Number of moles of mercury = Number of atoms = moles of Hg x
= 0.4985 x
= 3.00097 x atoms.
Hence, 3.00097 x atoms are contained in 100.0 g of mercury.
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Answer:
Explanation:
In the first nucleus we are told that there are two protons and one neutron. Let us remember that the mass number = number of protons + number of neutrons.
This implies that, for the first specie the mass number is 3, for the second specie the mass number is 6 and the third specie has a mass number of 7 and so on. The mass number is indicated as a superscript.
The atomic number is the number of protons in the nucleus of the atom and helps us to identify the atom. It is always written as a subscript as shown.