The molar mass of H2O2 is 34 g/mol.
Molar mass of sodium chloride is 22.99 g/mol (Na+) + 35.45 g/mol (Cl-) = x g/mol. Then take the mass of sodium chloride sample 5 grams and divide by molar mass to get the number of moles. Take this number and multiply it by Avogadro’s number (6.22*10^23 molecules/mol). You now have the amount of molecules in 5 grams of NaCl.
Answer A
x-ray optical telescope.
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An chemical symbol is an abbreviation for the name of an element and usually had either one or 2 letters.
