Lithium forms a +1 ion because it loses one electron, making the ratio of electrons:protons unbalanced by losing one electron. the ratio is now 2e:3p.
Oxygen forms a -2 ion because of a different reason. It gains 2 electrons rather than losing them.
Answer:
The answer to your question is 98.9 %
Explanation:
Data
moles of methane = CH₄ = 2.0
excess air
Percent yield = ?
mass of CO₂ = 87 g
- Balanced chemical reaction
CH₄ + 2O₂ ⇒ CO₂ + 2H₂O
Reactants Elements Products
1 C 1
4 H 2
4 O 2
- Calculate the molar mass of CH₄
CH₄ = 12 + 4 = 16 g
- Convert the moles to mass
16 g of CH₄ ----------------- 1 mol
x ----------------- 2 moles
x = (2 x 16) / 1
x = 32 g of CH₄
-Calculate the theoretical formation of CO₂
16 g of CH₄ ----------------- 44 g of CO₂
32 g of CH₄ ---------------- x
x = (32 x 44) / 16
x = 88 g of CO₂
-Calculate the Percent yield
Percent yield = Actual yield/Theoretical yield x 100
Percent yield = 87/88 x 100
Percent yield = 98.9 %
It is the bottom answer. (77.5)
D
Explanation:
Particles of the same charge repel each other
Answer:
Mass = 0.61 g
Explanation:
Given data:
Pressure of neon gas = 720 mmHg
Temperature = -15.0°C
Volume = 760 mL
Mass of neon gas = ?
Solution:
720 mmHg = 720/760 = 0.95 atm
-15.0°C + 273 = 258 K
760/1000 = 0.76 L
PV = nRT
n = PV/RT
n = 0.95 atm ×0.76 L/ 0.0821 atm. L. k⁻¹.mol⁻¹× 258 K
n = 0.722 atm. L/ 21.2 atm. L. mol⁻¹
n = 0.03 mol
Mass of neon:
Mass = number of moles × molar mass
Mass = 0.03 mol × 20.2 g/mol
Mass = 0.61 g
