Answer:
1.208x10⁻³M and 392.5ppm La(NO3)3
Explanation:
The reaction that occurs is:
La2O3 + 6HNO3 → 2La(NO3)3 + 3H2O
Molarity is defined as the moles of solute (In this case, LaO3) per liter of solution. And ppm, are mg of solute per liter of solution.
To solve this question we must find the moles of La(NO3)3 produced and its mass in milligrams to find molarity and ppm:
<em>Moles La2O3 -Molar mass: 325.81g/mol-</em>
0.1968g * (1mol / 325.81g) = 6.04x10⁻⁴ moles La2O3
<em>Moles La(NO3)3:</em>
6.04x10⁻⁴ moles La2O3 * (2mol La(NO3)3 / 1mol La2O3) = 1.208x10⁻³ moles La(NO3)3
<em>Molarity:</em>
1.208x10⁻³ moles La(NO3)3 / 1L =
<h3>1.208x10⁻³M</h3>
<em>Mass La(NO3)3 -Molar mass: 324.92g/mol-</em>
1.208x10⁻³ moles La(NO3)3 * (324.92g / mol) = 0.392.5g La(NO3)3
In mg:
392.5mg La(NO3)3 / 1L =
392.5ppm La(NO3)3
I wrote down the explanations, hope this helps!!!!
2) 2.8 atm
3) 704.7 mm Hg
4) 83.66 kPa
Answer:
Zn. + 2 HCl ----------> ZnCl2. + H2
Explanation:
Mass of Zn in mole = 3.27/ 65.38= 0.050010.... mol
Mass of HCl in mole = 3.3/ 73= 0.044....mol
Hence, limiting reagent is HCl
Molar mass of ZnCl2= 136.38g
Let mass of ZnCl2 be x
x = 3.3*136.38÷ 73 = 6.165...
So, the mass of ZnCl2 is 6.17 g
Answer:
Please check image and explanation
Explanation:
Lewis structure means drawing all the lone pair and bond pair around the atom and also lone pair of electron is represented as pair of dot except in the odd electron system where electron is denoted by only one dot. single bond is denoted by single line and similarly double bond denoted by two parallel line and so on
generally less electronegative atom is taken as central atom or atom having more covalency.
We are given with
<span>1.80 × 10–4 g K2SO4
</span><span>1.50 L of water
The concentration of K2SO4 is
</span>1.80 × 10–4 g K2SO4 x (1 mole K2SO4 / 174 g K2SO4) x (1 / 1.50 L)
= 6.897 x 10-7 M
Since K2SO4 dissociates into
K2SO4 <=> 2K+ + SO4-2
The concentration of K+ ions is
2 x 6.897 x 10-7 M = 1.379 x 10-6 M
The concentration of SO4-2 is the same as that of K2SO4
1.379 x 10-6 M
