Answer:
0.868M Cu⁺
Explanation:
The reaction is:
KMnO₄ + 5Cu⁺ + 8H⁺ → 5Cu²⁺ + Mn²⁺ + K⁺ + 4H₂O
<em>Where 1 mol of KMnO₄ reacts with 5 moles of Cu⁺</em>
<em />
3.30x10⁻²L of 0.132M KMnO₄ are:
3.30x10⁻²L × (0.132mol KMnO₄ / L) = <em>4.356x10⁻³mol KMnO₄</em>
As 1 mol reacts with 5 moles of Cu⁺, moles of Cu⁺ are:
4.356x10⁻³mol KMnO₄ × (5mol Cu⁺ / 1mol KMnO₄) = <em>0.02178moles Cu⁺</em>
As these moles are in 2.51x10⁻²L, the starting concentration of the Cu⁺ solution is:
<em>0.02178moles Cu⁺ / </em>2.51x10⁻²L = <em>0.868M Cu⁺</em>
Answer:
Molar concentration of
solution = 0.0056 moles / liter
Explanation:
Looking at the chemical reaction we realize that the precipitate, formed by adding the iron powder, is cooper.
Then for finding the number of moles of precipitated copper:
![number.of.moles= \frac{mass (g)}{molecular.mass (g/mole)}](https://tex.z-dn.net/?f=%20number.of.moles%3D%20%5Cfrac%7Bmass%20%28g%29%7D%7Bmolecular.mass%20%28g%2Fmole%29%7D)
![number.of.moles.of.solid.copper = \frac{0.089}{63.5} =1.4*10^{3}](https://tex.z-dn.net/?f=number.of.moles.of.solid.copper%20%3D%20%5Cfrac%7B0.089%7D%7B63.5%7D%20%3D1.4%2A10%5E%7B3%7D)
From the chemical reaction we deduce that
moles of Cu equals to
moles of
in the initial solution.
So molar concentration is defined as:
![molar.concentration = \frac{number.of.moles}{solution.volume (liters)}](https://tex.z-dn.net/?f=molar.concentration%20%3D%20%5Cfrac%7Bnumber.of.moles%7D%7Bsolution.volume%20%28liters%29%7D)
![molar.concentration.of.CuSO_4.solution= \frac{1.4*10^{3}}{0.250}= 5.6*10^{3} moles/liter = 0.0056 moles/liter](https://tex.z-dn.net/?f=molar.concentration.of.CuSO_4.solution%3D%20%5Cfrac%7B1.4%2A10%5E%7B3%7D%7D%7B0.250%7D%3D%205.6%2A10%5E%7B3%7D%20moles%2Fliter%20%3D%200.0056%20moles%2Fliter)
Answer:
Coefficients represents no of moles while subscripts represent no of atoms.
Answer:
metal atoms lose electrons to form positive ions (cations ) non-metal atoms gain electrons to form negative ions (anions )
i agree with this answer from the person above me: Augustlonley
Explanation:
*throws leaves in his face* Hey you wake up!!
Answer:
_2Mg + _O2 --≥2MgO this is balanced