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3 years ago

9

Given that XeF4 reacts with water to form explosive XeO3, chemists would not handle it near water. However, why would you still

not want to work with it on the lab bench, even if there was apparently no water around?

1 answer:

Svetlanka [38]3 years ago

8 0

Bro that’s so cool man have a good day

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A certain liquid has a normal boiling point of and a boiling point elevation constant . A solution is prepared by dissolving som

PSYCHO15rus [73]

This question is incomplete, the complete question is;

A certain liquid X has a normal boiling point of 150.4 °C and a molar boiling point elevation constant kb is 0.60 °Ckgmol⁻¹.

A solution is prepared by dissolving some urea (NH22CO) in 750 g of X. This solution boils at 150.9 °C . Calculate the mass of urea that was dissolved. Round your answer to 3 significant digits.

Answer:

the mass of urea that was dissolved is 37.5 g

Explanation:

Given the data in the question;

normal boiling point of X; Tb⁰ = 150.4 °C

boiling point of solution Tb = 150.9 °C

Change in boiling point Δt = Tb - Tb⁰ = 150.9 °C - 150.4 °C = 0.5 °C

Kb = 0.6 °C.kg.mol⁻¹

V = 750 g

Now, we know that

Δt = Kb × molality

so

0.5 = 0.6 × molality

molality = 0.5 / 0.6

molality = 0.833

we know that molar mass of urea is 60 g/mol

so

molality = mass × 1000 / molar mass × volume( g )

we substitute

0.833 = ( mass × 1000 ) / ( 60 × 750 )

0.833 = ( mass × 1000 ) / 45000

0.833 × 45000 = mass × 1000

mass = ( 0.833 × 45000 ) / 1000

mass = 37485 / 1000

mass = 37.485 ≈ 37.5 g { 3 significance figure }

Therefore, the mass of urea that was dissolved is 37.5 g

8 0

2 years ago

¿la densidad de una solución es mayor o menor al agregar agua?

andreev551 [17]

Answer:

La densidad experimenta una disminución

Explanation:

Hola!

En este caso, debemos recordar que la adición de agua incrementa el volumen donde se encuentra un soluto disuelto, el cual posee una cantidad de materia constante. De este modo, sabiendo que la densidad es:

$\rho =\frac{m}{V}$

Al incrementar el denominador (volumen), la densidad experimenta una disminución, al estar en relación inversamente proporcional.

Muchos saludos!

5 0

3 years ago

Animals have internal stimuli or cues that help them survive. Which stimuli is external rather than internal?

dem82 [27]

D bc people can feel how hot u are

4 0

3 years ago

Solid iron is mixed with a solution of copper (I) nitrate to form iron (III) nitrate solution and metal copper. (what is the equ

DedPeter [7]

Answer:

Fe + 3CuNO₃ → Fe(NO₃)₃ + 3Cu

Explanation:

Solid Iron = Fe

Copper (I) nitrate = CuNO₃ (Nitrate, NO₃⁻, always has a charge of -1).

Iron (III) nitrate = Fe(NO₃)₃ (That way the compound has an overall neutral charge)

Metal Copper = Cu

Writing the equation using symbols leaves us with:

Fe + CuNO₃ → Fe(NO₃)₃ + Cu

<em>It is not balanced yet</em>. Now we <u>balance the NO₃ species on the left side</u>:

Fe + 3CuNO₃ → Fe(NO₃)₃ + Cu

Finally we<u> balance the Cu species on the right side</u>:

Fe + 3CuNO₃ → Fe(NO₃)₃ + 3Cu

5 0

3 years ago

Among the groups of elements listed below, which have the same number of electrons in their outermost energy levels? C, K, Ca, R

tatyana61 [14]

Answer:

i believe its d

Explanation:

3 0

3 years ago

Read 2 more answers