Chemistry: What is the mass of 4.50 moles of magnesium chloride, MgCl2?

What is the mass of 4.50 moles of magnesium chloride,

Ответ:

Arealbot

16.03.2022

Chemistry

427.5g

Explanation:

Given parameters:

Number of moles = 4.5moles

Unknown:

Mass of MgCl₂ = ?

Solution:

To solve this problem;

Mass = number of moles x molar mass

Molar mass of MgCl₂ = 24 + 2(35.5) = 95g/mol

Mass = 4.5 x 95 = 427.5g

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Ответ:

Daxtyn

16.05.2023

Chemistry

The mass of each substance can be found through stoichiometric calculation as follows:

$\frac{g}{u} = \frac{a}{C}$

where "g" is the mass of substance, "u" is the relative atomic mass, "a" is the number of atoms or molecules and "C" is Avogadro's number.

Making use of that formula, we have:

a) 6.02 x 10²³ atoms of Mg.

$
\frac{g}{24.3}= \frac{6.02\times 10^{23}}{6.02 \times10^{23}} \\ \boxed {g= 24.3~g}$

b) 12.4 x 10¹⁵ molecules of CH₂O.

$\frac{g}{12+2 \times 1+16}= \frac{12.4\times 10^{25}}{6 \times10^{23}} \\ g= \frac{30 \times 12.4 \times 10^{25}}{6 \times10^{23}} \\ \boxed {g= 6.2~kg}$

c) 3.01 x 10²³ formula units of CaCl₂

$\frac{g}{40+2 \times 35.5}= \frac{3.01 \times 10^{25}}{6 \times10^{23}} \\ g= \frac{111 \times 3.01 \times 10^{25}}{6 \times10^{23}} \\ \boxed {g= 5.5685~kg}$

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What is the mass of 4.50 moles of magnesium chloride, MgCl2?

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