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3 years ago

How many moles of molecules are in 40g of H2O?

Chemistry

2 answers:

soldier1979 [14.2K]3 years ago

6 0

Molecular mass of H2O is: 16+2*1=18
so moles of 40g of H2O is: 40/18=2.22

yanalaym [24]3 years ago

4 0

<span>The question seems to be confusing but what I understood is that we are asked the number of moles for 40 g of H2O. The molar mass of H2O is the some of the atomic masses of the elements involved which would be 18.02 g/mol

40 g H2O ( 1 mol / 18.02 g ) = 2.22 mol H2O

Hope this answers the question. Have a nice day.</span>

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Read 2 more answers

One mole of a metallic oxide reacts with one mole of hydrogen to produce two moles of the pure metal

aleksley [76]

Answer:

Lithium oxide, Li₂O.

Explanation:

Hello!

In this case, according to the given amounts, it is possible to write down the chemical reaction as shown below:

$M_2O+H_2\rightarrow 2M+H_2O$

Which means that the metallic oxide has the following formula: M₂O. Next, we can set up the following proportional factors according to the chemical reaction:

Thus, we perform the operations in order to obtain:

$\frac{10X}{(2X+16)}=2.32$

So we solve for x as shown below:

$10X=2.32(2X+16)\\\\10X=4.64X+37.12\\\\X=\frac{37.12}{10-4.64}\\\\X= 6.93g/mol$

Whose molar mass corresponds to lithium, and therefore, the metallic oxide is lithium oxide, Li₂O.

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