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ch4aika [34]
3 years ago
14

What is the molas mass of lithium oxide li2o

Chemistry
2 answers:
gladu [14]3 years ago
7 0
The molar mass of lithium oxide is 
29.88 g/mol
Alexxandr [17]3 years ago
6 0

Explanation:

Atomic mass means the sum of total number of protons and neutrons present in an element.

Molar mass is defined as the mass of one mole of a compound present in grams.  

For example, molar mass of Li_{2}O is as follows.

      Molar mass of Li_{2}O = 2 × atomic mass of Li + atomic mass of O

                                     = 2 \times 6.94 g/mol + 16.0 g/mol

                                     = 13.88 g/mol + 16.0 g/mol

                                      = 29.88 g/mol

Thus, we can conclude that molar mass of Li_{2}O is 29.88 g/mol.

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3 years ago
A metal, M, forms an oxide having the formula MO2 containing 59.93% metal by mass. Determine the atomic weight in g/mole of the
Damm [24]

Answer:

See solution.

Explanation:

Hello there!

In this case, according to the given information, it turns out possible for us to set up the formula for the calculation of the by-mass percentage of the metal:

\%  M=\frac{m_M}{m_M+2*m_O}*100 \%\\\\59.93\%  =\frac{m_M}{m_M+32.00}*100 \%

Thus, we solve for the molar mass of the metal to obtain:

59.93\% (m_M+32.00) =m_M*100 \%\\\\m_M*59.93\% +1917.76\% =m_M*100 \%\\\\m_M=47.86g/mol

For the subsequent problems, we proceed as follows:

a.

4.00gO_2*\frac{1molO_2}{32.00gO_2}=0.125molO_2

b.

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c.

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Regards!

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3 years ago
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Answer:

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Explanation:

I hope it helps

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