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2 years ago

How many moles of aluminum are needed to react completely with 4.8 mol of FeO?

1 answer:

6 0

Answer:How many moles of aluminum are needed to react completely with 1.2 mol of FeO? 2Al(s) + 3FeO(s) = 3Fe(s) + Al2O3(s). 0.8 mols.

Explanation:

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A container holds 6. 4 moles of gas. Hydrogen gas makes up 25% of the total moles in the container. If the total pressure is 1.

ipn [44]

In a mixture of gases, the total pressure is equivalent to the aggregate of all the partial pressures of the single element of the gas.

It can be written as $\rm P _{total}$ = P₁ + P₂ + P₃ and so on.

The partial pressure will be:

Option A. 0. 31 atm

Pressure can be estimated by:

$\rm P_{total} = \dfrac{n _{total }RT}{ V}$

$\rm P_{total} = \dfrac{n _{H_{2}} + n _{\rm other \;gases}}{ V}$

Where,

$\rm nH_{2} = 25\% \times n_{Total}$

And,

$\begin{aligned}\rm P_{H_{2}} &= 25\% \times \rm P_{Total}\\\\& = 25\% \times 1.24 \;\rm atm\\\\& = 1.24 \rm \;atm \times 25 \end{aligned}$

Solving finally we get,

$\rm P_{H_{2}} = 0.31 \;\rm atm$

Therefore, 0.31 atm is the partial pressure of the hydrogen gas.

To learn more about partial pressure follow the link:

brainly.com/question/1471705

3 0

2 years ago

What did Dalton’a atomic theory teach?

seraphim [82]

That John Dalton was an English chemist that was most famous for proposing atomic chemistry.He proposed atomic theory in 1803,which states that all matter is composed of small indivisible particles called atoms.

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3 years ago

Consider the reaction of CaC2 and water to produce CaCO3 and NH3 according to the reaction CaCN2 + 3H2O → CaCO3 + 2 NH3 . How mu

xz_007 [3.2K]

Answer:

16.27 g of CaCO3 are produced upon reaction of 45 g CaCN2 and 45 g of H2O.

Explanation:

Ca(CN)2 + 3H2O → CaCO3 + 2 NH3

First of all, let's find out the limiting reactant.

Molar mass Ca(CN)2.

Molar mass H2O: 18 g/m

Moles of Ca(CN)2: mass / molar mass

45 g / 92.08 g/m = 0.488 moles

Moles of H2O: mass / molar mass

45g / 18g/m = 2.50 moles

This is my rule of three

1 mol of Ca(CN)2 needs 3 moles of H2O

2.5 moles of Ca(CN)2 needs (2.5 . 3) / 1 = 7.5 moles

I need 7.5 moles of water, but I only have 0.488. Obviously water is the limiting reactant; now we can work on it.

3 moles of water __ makes __ 1 mol of CaCO3

0.488 moles of water __ makes ___ (0.488 . 1) / 3 = 0.163 moles

Molar mass CaCO3 = 100.08 g/m

Molar mass . moles = mass

100.08 g/m . 0.163 moles = 16.27 g

4 0

3 years ago

Why do scientists use the scientific method?

xeze [42]

Answer:

Scientists use the scientific method because it is evidence-based, standardized and objective in conducting experiments. The scientific method allows scientists to stick to facts and to avoid the influence of preconceived notions and personal biases in research processes, improving the credibility of research findings.

Explanation:

4 0

3 years ago

Fluorine has an atomic number 9. It is in period 2 of the periodic table. The diagram shows the electron dot diagram of a fluori

jek_recluse [69]

Fluorine has C seven valence electrons.

Valence electrons are the electrons that are found on the outer shell of an atom that are capable of participating in chemical reactions. The easiest way to figure out how many valance electrons Fluorine has would be to look it up in a periodic table and notice that it a group 7 element and therefore has 7 valence electrons.

The other way to tell that Fluorine has 7 valence electrons is to notice that an element with an atomic number of 9 has 9 electrons. The electronic configuration of elements has the first 2 electrons go on the first shell or energy level $1s^2$ , the leaving the next 7 to go to the second shell $2s^22p^5$ which can take up to 8 electrons.

This means that Fluorine has 7 seven valence electrons.

6 0

3 years ago

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