Answer:
Mass of carbon = 109.1 g
Explanation:
Given data:
Mass of carbondioxide = 400 g
Mass of carbon = ?
Solution:
Molar mass of carbon = 12 g/mol
Molar mass of CO₂ = 44 g/mol
Mass of carbon in 400g of CO₂:
Mass of carbon = 12 g/mol/44 g/mol × 400 g
Mass of carbon = 109.1 g
The rate at which a radioactive isotope decays is measured in half-life. The term half-life is defined as the time it takes for one-half of the atoms of a radioactive material to disintegrate. Half-lives for various radioisotopes can range from a few microseconds to billions of years.
Answer:
true or false
a. very little oxygen and nitrogen are found in air. false
b. oxygen is the main cause of the formation of rust in iron. false
c. impure air is odourless true
.d. plants take in oxygen gas during respiration. true
e. air contains water vapour. true
Explanation:
The Ksp of PbSO₄ = 2.53 × 10⁻⁷
for srSO₄→ 3.44 × 10⁻⁷
for srSO₄
srSO₄→ Sr²⁺ + SO₄⁻
Ksp = [sr²⁺] [SO₄⁻]
3.44 ˣ 10⁻⁷ = (0.0330M) [ SO₄⁻]
[SO₄⁻] = 8.1 ˣ 10⁻⁶M
foe Pb SO₄
PbSO₄ →Pb²⁺ + SO₄⁻
Ksp = [ Pb²⁺] [ SO₄⁻]
2.53 ˣ 10⁻⁸M
= [ Pb²⁺] (8.1 ˣ10⁻⁶M)
[Pb²⁺] = 2.75 ˣ 10⁻³M
Answer:
HOCH₂CH₂CH₂OH Propane-1,3-diol
Explanation:
The boiling point of compound depends up on Hydrogen bonding and vander wall forces. The C option that is alcohol will have higest boiling point assuming that the mass is approximately same (between 60-80) and the boiling point is hight because this is due to extensive intra molecular hydrogen bonding in alcohol .Hence due to hydrogen bonding the molecules are packed close and that increases the boiling point of the molecule.The Answer is option C.
HOCH₂CH₂CH₂OH > CH₃CH₂CH₂CH₂OH > CH₃CH₂CH₂CH₂CH₃ > CH₃CH₂CH₂CH₂CH₃ > CH₃CH₂CH₂OCH₃
