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Novay_Z [31]
3 years ago
12

Now draw the eight planets as circles, and label each one. The scale doesn’t need to be perfect. You can estimate the planets’ s

izes based on the real-world objects you chose in part A.

Chemistry
2 answers:
Brut [27]3 years ago
4 0
The answer is Joe mamma
Ierofanga [76]3 years ago
3 0

i dont now but thaks you po por the pionts

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A certain substance X has a normal freezing point of 5.6 °C and a molal freezing point depression constant Kf-7.78 °C-kg·mol-1.
Harrizon [31]

Answer:

27.60 g urea

Explanation:

The <em>freezing-point depression</em> is expressed by the formula:

  • ΔT= Kf * m

In this case,

  • ΔT = 5.6 - (-0.9) = 6.5 °C
  • Kf = 7.78 °C kg·mol⁻¹

m is the molality of the urea solution in X (mol urea/kg of X)

First we<u> calculate the molality</u>:

  • 6.5 °C = 7.78 °C kg·mol⁻¹ * m
  • m = 0.84 m

Now we<u> calculate the moles of ure</u>a that were dissolved:

550 g X ⇒ 550 / 1000 = 0.550 kg X

  • 0.84 m = mol Urea / 0.550 kg X
  • mol Urea = 0.46 mol

Finally we <u>calculate the mass of urea</u>, using its molecular weight:

  • 0.46 mol * 60.06 g/mol = 27.60 g urea

7 0
3 years ago
Texture provides clues about how igneous rocks were formed A. true B. False
hammer [34]
A.) true

Because the rocks are formed near lava so the texture would be smooth
3 0
3 years ago
What is the diffence between solids , liquids and gases ?
vfiekz [6]

Answer:

solid : it has molecules tightly packed

liquid : it has molecules loosely packed

gas : it has molecules very far from each other

please mark as brainliest . please !

6 0
3 years ago
In calculating the concentration of [Cu(NH3)4]2+ from [Cu(H2O)4]2+, the stepwise formation constants are as follows: K1=1.90×104
pashok25 [27]

Answer:

Kf = 1.11x10¹³

Explanation:

The value of Kf for a multistep process that involves an equilibrium at each step, is the multiplication of the constant of the equilibrium of each step.

Kf = K1xK2xK3xK4

Kf = 1.90x10⁴ x 3.90x10³ x 1.00x10³ x 1.50x10²

Kf = 1.11x10¹³

4 0
3 years ago
Are the components of a solution fixed?
liq [111]

Answer:

yes

Explanation:

the components of solutions fixed

3 0
3 years ago
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