Answer:
3.0 × 10²⁰ molecules
Explanation:
Given data:
Mass of ethanol = 2.3 × 10⁻²°³ g
Number of molecules = ?
Solution:
Number of moles of ethanol:
Number of moles = mass/ molar mass
Number of moles = 2.3 × 10⁻²°³ g / 46.07 g/mol
Number of moles = 0.05 × 10⁻²°³ mol
Number of molecules:
One mole = 6.022 × 10²³ molecules
0.05 × 10⁻²°³ mol × 6.022 × 10²³ molecules / 1 mol
0.30 × 10²⁰°⁷ molecules
3.0 × 10¹⁹°⁷ molecules which is almost equal to 3.0 × 10²⁰ molecules.
Phospholipids and embedded proteins make up the cell membrane.
Answer:
The early atmosphere
Its early atmosphere was probably formed from the gases given out by volcanoes. It is believed that there was intense volcanic activity for the first billion years of the Earth's existence. The early atmosphere was probably mostly carbon dioxide, with little or no oxygen.
Explanation:
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KOH(s) ----> K⁺(aq)+OH⁻ (aq)
s-solid,
aq - aqueous
Cu-63 and Cu-65 have 34 and 36 neutrons, respectively, in each atom. 27- Because copper has an atomic number of 29, which essentially implies that an atom of copper has 29 protons and 29 electrons, an atom of copper has a total of 29 electrons.
The stable isotope of copper is copper-63, which has a nuclear spin of 3/2, a relative atomic mass of 62.929601, and a natural abundance of 69.2 atoms. a trace element of a heavy metal having the atomic symbols Cu, 29, and 63.55. This atom has the mass number 63 because it is a copper-63 atom. Every atom of a particular element has the same atomic number, which may be determined as the element's number on the predictable.
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