The answer is SiO2
Since silicon has four valence electrons and each oxygen has 2, for every 1 silicon there must be 2 oxygen to fill in both element's outer shells satisfactorily. An alternative way to figure out the chemical formula is to simply swap the charges.
Silicon is a -4 and oxygen is a -2.
Oxygen's charge is brought down into subscript and set as the number of silicons in the chemical formula, making silicon Si2. Silicon's charge is brought down to make the number of oxygens in the chemical formula O4. The formula we have currently is Si2O4. Simplify it to get the empirical formula (divide by 2) and you get SiO2.
As,
CuCO₃ ⇆ Cu²⁺ + CO₃²⁻
So,
Kc = [Cu²⁺] [CO₃²⁻] / CuCO₃
Or,
Kc (CuCO₃) = [Cu²⁺] [CO₃²⁻]
Or,
Ksp = [Cu²⁺] [CO₃²⁻]
As,
Ksp = 1.4 × 10⁻¹⁰
So,
1.4 × 10⁻¹⁰ = [x] [x]
Or,
x² = 1.4 × 10⁻¹⁰
Or,
x = 1.18 × 10⁻⁵ mol/L
To cahnge ito g/L,
x = 1.18 × 10⁻⁵ mol/L × 123.526 g/mol
x = 1.45 × 10⁻³ g/L
Answer:
The answer is D.
Explanation:
I learned about this last year. Its very simple if you let your parents or teachers explain it to you!
Answer:
0.4777 cm³
Explanation:
Molar mass is defined as the mass of 1 mole of the substance.
The molar mass fo Ag is 107.8682 g/mol
Since, 1 mole of Ag contains 6.022×10²³ molecules of Ag
So,
6.022×10²³ molecules of Ag has a mass of 107.8682 g
Also,
1 molecule of Ag has a mass of 107.8682/6.022×10²³ g
2.8×10²² molecules of Ag has a mass of (107.8682/6.022×10²³)×2.8×10²² g
Mass of 2.8×10²² molecules = 5.0155 g
Given that density = 10.5 g/cm³
Volume = ?
So, volume:
<u>Volume = 0.4777 cm³</u>