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Elena-2011 [213]
2 years ago
10

¿Qué son los lantánidos y actínidos?

Chemistry
1 answer:
harkovskaia [24]2 years ago
6 0

Answer: En estos grupos de los elementos de transición se encuentran las llamadas tierras raras, separadas del resto de elementos de la tabla, que pertenecen al grupo IIIB y se les conoce como lantánidos y actínidos.

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The main-group elements are the forty-four elements that occupy groups 1A-8A of the periodic table. Main-group elements are impo
nignag [31]

Answer:

The answer is a,b, and c. This is for the USA tesprep videos

Explanation:

7 0
2 years ago
A 6.00 L vessel contains 20.0 g of PCl3 and 3.15 g of O2 at 15.0 ∘C. The vessel is heated to 210 ∘C, and the contents react to g
dusya [7]

<u>Answer:</u> The final pressure in the vessel will be 0.965 atm

<u>Explanation:</u>

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}      .....(1)

  • <u>For phosphorus trichloride:</u>

Given mass of phosphorus trichloride = 20.0 g

Molar mass of phosphorus trichloride = 137.3 g/mol

Putting values in equation 1, we get:

\text{Moles of phosphorus trichloride}=\frac{20.0g}{137.3g/mol}=0.146mol

  • <u>For oxygen gas:</u>

Given mass of oxygen gas = 3.15 g

Molar mass of oxygen gas = 32 g/mol

Putting values in equation 1, we get:

\text{Moles of oxygen gas}=\frac{3.15g}{32g/mol}=0.098mol

The chemical equation for the reaction of phosphorus trichloride and oxygen gas follows:

2PCl_3+O_2\rightarrow 2POCl_3

By Stoichiometry of the reaction:

2 moles of phosphorus trichloride reacts with 1 mole of oxygen gas

So, 0.146 moles of phosphorus trichloride will react with = \frac{1}{2}\times 0.146=0.073mol of oxygen gas

As, given amount of oxygen gas is more than the required amount. So, it is considered as an excess reagent.

Thus, phosphorus trichloride is considered as a limiting reagent because it limits the formation of product.

By Stoichiometry of the reaction:

2 moles of phosphorus trichloride produces 2 moles of POCl_3

So, 0.146 moles of phosphorus trichloride will produce = \frac{2}{2}\times 0.146=0.146mol of POCl_3

To calculate the pressure of the vessel, we use the equation given by ideal gas follows:

PV=nRT

where,

P = pressure of the vessel = ?

V = Volume of the vessel = 6.00 L

T = Temperature of the vessel = 210^oC=[210+273]K=483K

R = Gas constant = 0.0821\text{ L. atm }mol^{-1}K^{-1}

n = number of moles = 0.146 moles

Putting values in above equation, we get:

P\times 6.00L=0.146mol\times 0.0821\text{ L atm }mol^{-1}K^{-1}\times 483K\\\\P=\frac{0.146\times 0.0821\times 483}{6.00}=0.965atm

Hence, the final pressure in the vessel will be 0.965 atm

3 0
3 years ago
Read 2 more answers
Which of these chemical formulas represents both an element and a molecule?
inna [77]
O2.

Because it is only made up of one type of element it is an element. Howevern there is more than one oxygen atom because oxygen cannot exist as a single atom, therefore making it a molecule as well.
8 0
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How many milliliters of an aqueous solution of 0.193 M potassium carbonate is needed to
VikaD [51]

Answer:

295 mL

Explanation:

Given data:

Volume needed = ?

Molarity of solution = 0.193 M

Mass of salt = 7.90 g

Solution:

Molarity =  number of moles of solute / volume in L

Number of moles of salt = mass/molar mass

Number of moles of salt = 7.90 g/ 138.205 g/mol

Number of moles = 0.057 mol

Volume needed:

Molarity = number of moles / volume in L

0.193 M = 0.057 mol / volume in L

Volume in L = 0.057 mol /  0.193 M

Volume in L = 0.295 L

L into mL

0.295 L × 1000 mL/1L

295 mL

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Atoms of one element are converted to atoms of another element through
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Atoms of one element are converted to atoms of another element through transmutation or nuclear transmutation.
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