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4 years ago

What is the mass in grams of 85.32 mL of blood plasma with a density of 1.03 g/mL?

Chemistry

1 answer:

Aleksandr [31]4 years ago

5 0

Mass=density x volume, i.e. 1.03 x 85.32 = 87.88 g

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Explanation:

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3 years ago

What is the result of multiplying (2.5 × 1010) × (2.0 × 10-7)?

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4 years ago

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Write the isotopic symbol for the following (show your work) a) An isotope of iodine whose atoms have 78 neutrons b) An isotope

morpeh [17]

Answer:

For a: The isotopic representation of iodine is $_{53}^{131}\textrm{I}$

For b: The isotopic representation of cesium is $_{55}^{137}\textrm{Cs}$

For c: The isotopic representation of strontium is $_{38}^{52}\textrm{Sr}$

Explanation:

The isotopic representation of an atom is: $_Z^A\textrm{X}$

where,

Z = Atomic number of the atom

A = Mass number of the atom

X = Symbol of the atom

For a:

We are given:

Number of neutrons = 78

Atomic number of iodine = 53 = Number of protons

Mass number = 53 + 78 = 131

Thus, the isotopic representation of iodine is $_{53}^{131}\textrm{I}$

For b:

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Number of neutrons = 82

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Thus, the isotopic representation of cesium is $_{55}^{137}\textrm{Cs}$

For c:

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Number of neutrons = 52

Atomic number of strontium = 38 = Number of protons

Mass number = 38 + 52 = 90

Thus, the isotopic representation of strontium is $_{38}^{52}\textrm{Sr}$

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