Answer:
Molecular mass is a number equal to the sum of the atomic masses of the atoms in a molecule.
Explanation:
The molecular mass gives the mass of a molecule relative to that of the 12 C atom, which is taken to have a mass of 12. Hence why Molecular mass is a number equal to the sum of the atomic masses of the atoms in a molecule.
Answer:
Hey mate.....
Explanation:
This is ur answer........
<em>For example, the communications industry includes all of the physical and social systems that produce books, newspapers, magazines, radio and television broadcasts, billboard advertisements, Internet websites, telephones, and telecommunications, such as the GPS.</em>
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To calculate moles of any 
of a subtance, we need to divide the given mass by the molar mass of the substance that is 
given as per the question. By simply putting the values of the two masses we will be left with the number of moles of the given substance.
where, n= number of moles of given substance (mol)
m= given mass of the substance (grams)
M= molar mass of the given substance (grams/mol)
Answer:
A chemical reaction expresses a chemical change. For example, one chemical property of hydrogen is that it will react with oxygen to make water. We can write that as follows:
hydrogen reacts with oxygen to make water
We can represent this chemical change more succinctly as
hydrogen + oxygen → water
where the + sign means that the two substances interact chemically with each other and the → symbol implies that a chemical reaction takes place. But substances can also be represented by chemical formulas. Remembering that hydrogen and oxygen both exist as diatomic molecules, we can rewrite our chemical change as
H2 + O2 → H2O
I would say <span>B. evaporation
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