He was brought to be believe that the earth was geocentric, meaning the earth was centered and everything orbited around it but he then published his work saying that is was heliocentric. So in the end believed in heliocentric. Let me know if this helped.
Answer:
K₂Cr₂O₇(s) ⇒ 2 K⁺(aq) + Cr₂O₇²⁻(aq)
Explanation:
Potassium dichromate (K₂Cr₂O₇) is a strong electrolyte, that is, when dissolved in water (the medium), it dissociates in cation potassium (K⁺) and anion dichromate (Cr₂O₇²⁻). The balanced dissociation equation is:
K₂Cr₂O₇(s) ⇒ 2 K⁺(aq) + Cr₂O₇²⁻(aq)
The molecular formula:
![N_x(O_2)_x](https://tex.z-dn.net/?f=N_x%28O_2%29_x)
![M_{N_x(O_2)_x}=x \times M_N + x \times 2 \times M_O \\ \\ m_N=14 \ \frac{g}{mol} \\ m_O=16 \ \frac{g}{mol} \\ M_{N_x(O_2)_x}=92 \ \frac{g}{mol} \\ \\ 92=x \times 14+x \times 2 \times 16 \\ 92=14x+32x \\ 92=46x \\ \frac{92}{46}=x \\ x=2 \\ \\ N_2(O_2)_2 \Rightarrow N_2O_4](https://tex.z-dn.net/?f=M_%7BN_x%28O_2%29_x%7D%3Dx%20%5Ctimes%20M_N%20%2B%20x%20%5Ctimes%202%20%5Ctimes%20M_O%20%5C%5C%20%5C%5C%0Am_N%3D14%20%5C%20%5Cfrac%7Bg%7D%7Bmol%7D%20%5C%5C%0Am_O%3D16%20%5C%20%5Cfrac%7Bg%7D%7Bmol%7D%20%5C%5C%20M_%7BN_x%28O_2%29_x%7D%3D92%20%5C%20%5Cfrac%7Bg%7D%7Bmol%7D%20%5C%5C%20%5C%5C%0A92%3Dx%20%5Ctimes%2014%2Bx%20%5Ctimes%202%20%5Ctimes%2016%20%5C%5C%0A92%3D14x%2B32x%20%5C%5C%0A92%3D46x%20%5C%5C%0A%5Cfrac%7B92%7D%7B46%7D%3Dx%20%5C%5C%0Ax%3D2%20%5C%5C%20%5C%5C%0AN_2%28O_2%29_2%20%5CRightarrow%20N_2O_4)
The molecular formula is N₂O₄.
Answer:
mole fraction benzene = 0.62
mole fraction toluene = 0.38
Explanation:
Raoults law for ideal solutions tells us that the totoal vapor pressure of the solution will be given by adding the partial pressures of the components of the solution and the partial pressures are simply given by the product of the component in solution times its pure vapor pressure at the temperature given:
<h2>p total = x₁ P⁰₁ + x₂ P⁰₂</h2>
where x1 and x2 for this solution denote the mole fractions of benzene and toluene and p⁰ ₁, p⁰₂ the vapor pressures of benzene and toluene respectively.
Solving the algebraic equation:
75 x₁ + 22 x₂ = 55
75 x₁ + 22 ( 1- x₁) = 55 (since x₁ + x₂ = 1)
75 x₁ + 22 - 22 x₁ = 55
53 x₁ = 33
x₁ = 0.62
x₂ = 1 - 0.62 = 0.38
The number of atoms that remains after 3 half-lives given that it was originally 300000 atoms is 37500 atoms
<h3>Data obtained from the question</h3>
- Original amount (N₀) = 300000 atoms
- Number of half-lives (n) = 3
- Amount remaining (N) =?
<h3>How to determine the amount remaining</h3>
The amount remaining after 3 half-lives can be obtained as illustrated below:
N = N₀ / 2ⁿ
N = 300000 / 2³
N = 300000 / 8
N = 37500 atoms
Learn more about half life:
brainly.com/question/26374513
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