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2 years ago

Where/ what do you get a mole ratio from?

Chemistry

2 answers:

sergeinik [125]2 years ago

4 0

mole ratio is derived when computing the empirical formula or on an chemical equation

babymother [125]2 years ago

3 0

Answer:

It takes two hydrogen atoms for every oxygen atom to produce this reaction, so the mole ratio between hydrogen and oxygen is 2:1. The reaction produces two water molecules, so the mole ratio between oxygen and water is 1:2, but the mole ratio between water and hydrogen is 2:2.

Explanation:

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Zn+2HCl=ZnCl2+H2 How many grams of ZnCl2 will be produced from 26.0 g of Zn and 42.0 g of HCl?

irakobra [83]

53.14 grams of Zn $Cl_{2}$ will be produced from 26.0 g of Zn and 42.0 g of HCl.

Explanation:

Balanced chemical reaction:

Zn + 2 HCl ⇒ Zn $Cl_{2}$ + $H_{2}$

data given:

mass of Zn = 26 grams

mass of HCl = 42 grams

mass of Zn $Cl_{2}$ = ?

here in the reaction Zn is the limiting reagent so mass of

Zn $Cl_{2}$ formed will be determined by it.

atomic mass of zinc =65.38 grams/mole

number of moles = $\frac{mass}{atomic mass of 1 mole}$

putting the values in the above equation:

number of moles of zinc = $\frac{26}{65.38}$

number of moles of zinc = 0.39 moles

From the balanced reaction it is seen that

1 mole of Zn produced 1 mole of Zn $Cl_{2}$

0.39 moles will produce x moles of Zn $Cl_{2}$

0.39 moles of Zn $Cl_{2}$ (atomic mass of Zn = 65.38 grams/mole)

mass = atomic mass x number of moles

= 0.39 x 136.28

= 53.14 grams

53.14 grams of Zn $Cl_{2}$ is formed

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3 years ago

Why is it useful to use moles to measure chemical quantities?

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<span>Because it is defined such that the mass of Avogadro's number of particles (atoms or molecules) of a substance (the molar mass) is equal to the sum of the numerical values of the atomic masses of its constituent elements</span>

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