How many grams are in 2.57x10^15 molecules of Co

Mass = 25.37 × 10⁻⁸ g

Explanation:

Given data:

Number of grams of Co = ?

Number of molecules = 2.57×10¹⁵

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

The number 6.022 × 10²³ is called Avogadro number.

For example,

18 g of water = 1 mole = 6.022 × 10²³ molecules of water

For Co:

2.57×10¹⁵ molecules × 1 mole / 6.022 × 10²³ molecules

0.43  × 10⁻⁸ moles

Mass of Co:

Mass = number of moles × molar mass

Mass = 0.43  × 10⁻⁸ mol × 59 g/mol

Mass = 25.37 × 10⁻⁸ g

the ratio of the conjugate base to the acid required to attain the desired ph.

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