An atomic mass unit is defined as a mass equal to one twelfth the mass of an atom of carbon-12. The mass of any isotope of any element is expressed in relation to the carbon-12 standard. For example, one atom of helium-4 has a mass of 4.0026 amu. An atom of sulfur-32 has a mass of 31.972 amu.
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.90 dL is 90 mL because 1 dL is 100 mL
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Amerigo Vespucci, was the first European to reach the Caribbean Islands.
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