Answer : The concentration of
are 0.127 ppm, 0.127 ppm and 0.254 ppm respectively.
Explanation : Given,
Mass of
= ![2.85\times 10^{-4}g](https://tex.z-dn.net/?f=2.85%5Ctimes%2010%5E%7B-4%7Dg)
Volume of solution = 2.25 L
First we have to calculate the concentration in terms of g/L.
![Concentration=\frac{Mass}{Volume}=\frac{2.85\times 10^{-4}g}{2.25L}=1.27\times 10^{-4}g/L=0.127mg/L](https://tex.z-dn.net/?f=Concentration%3D%5Cfrac%7BMass%7D%7BVolume%7D%3D%5Cfrac%7B2.85%5Ctimes%2010%5E%7B-4%7Dg%7D%7B2.25L%7D%3D1.27%5Ctimes%2010%5E%7B-4%7Dg%2FL%3D0.127mg%2FL)
conversion used : ![1g=1000mg](https://tex.z-dn.net/?f=1g%3D1000mg)
As we know that,
1 mg/L = 1 ppm
0.127 mg/L = 0.127 ppm
So, the concentration will be 0.127 ppm.
The concentration of
in ppm is, 0.127 ppm.
Now we have to calculate the concentration of
and
.
We assume that,
dissociates 100 % in the solution then the balanced reaction will be:
![MgCl_2(aq)\rightarrow Mg^{2+}(aq)+2Cl^-(aq)](https://tex.z-dn.net/?f=MgCl_2%28aq%29%5Crightarrow%20Mg%5E%7B2%2B%7D%28aq%29%2B2Cl%5E-%28aq%29)
From the reaction we conclude that the mole ratio of
is, 1 : 1 : 2. So,
The concentration of
= 0.127 ppm
The concentration of
= 2 × 0.127 ppm = 0.254 ppm
Answer:
Baking a cake is a chemical and irreversible change, because once the raw materials are chemically converted during baking, one cannot recover the raw materials from the cake
Answer: 7.41 L of O2
Explanation:
2H2O2(l) ----> 2H2O(l) + O2(g)
22.5 g H2O2 x __1 mol__ x __1 mol O2__ x __22.4 L__ = 7.41 L of O2
34.016 g 2 mol H2O2 1 mol O2
Answer:
[Cl⁻] = 1,5x10⁻⁴M
Explanation:
First of all, let's determinate the mole of each salt.
Molarity . volume = Mole
Volume must be in L, cause molarity is mol/L
NaCl → Na⁺ + Cl⁻
Ratio is 1:1
0.15 mol/L . 0.025L = 3.75x10⁻³ mole
As ratio is 1:1, from 3.75x10⁻³ mole of salt, I have 3.75x10⁻³ mole of chloride
CaCl₂ → Ca²⁺ + 2Cl⁻
Ratio is 1:2 so, from 1 mol of salt I'll get the double of mole of chloride
0.075 mol/L . 0.010 L = 7.5x10⁻⁴ mol
7.5x10⁻⁴ mol . 2 = 1.5x10⁻³ mole
Total mole of Cl⁻: 3.75x10⁻³ + 1.5x10⁻³ = 5.25x10⁻³
This 5.25x10⁻³ mole are present in a total volume of 35 mL.
Let's convert 35 mL in L → 0.035L (35/1000)
Molarity is mol/L → 5.25x10⁻³ mol / 0.035L = 1,5x10⁻⁴M
Answer:
B carbon
Explanation
Lewis structure or dot structure is an easy way to get the bonding details of atoms in a molecule. If we talk about methane molecule carbon is central atom with four electrons that are bonded to four hydrogen atoms and each bond is single covalent bond.
Please see attached figure,
Hope it helps!