Answer:
5 mg
Explanation:
If one half life is 4 hours, then 3 half lives is 12 hours.
This means that the sample will decay to 1/8 of its original amount.
So, the answer is 40(1/8) = 5 mg.
Answer:
3 is decomposition
4 is double replacement
Explanation:
In decomposition reactions, a compound (two or more elements) are broken down into singular elements.
Double replacement reactions have two different compounds, one element from a compound switches with another element in the other compound.
The mole ratio of the compound and its constituent elements are as follows:
- The mole ratio between the compound and O is 5 : 22
- The mole ratio between the compound and Si is 2 : 4
- The mole ratio between the compound and Ca is 5 : 20
- The mole ratio between the compound and C is 1 : 1
<h3>What is mole ratio?</h3>
Mole ratio is the ratio of the moles of one or more elements or compounds to another.
The given compound is Ca₄Si₂O₆(CO₃)(OH)₂
Moles of oxygen present in 1 mole of compound = 11 moles
Moles of Si present in 1 mole of compound = 2 moles
Moles of Ca present in 1 mole of compound = 4 moles
Moles of C present in 1 mole of compound = 1 mole
- Given 5 moles of the compound below, the mole ratio between the compound and O is 5 : 22
- Given 2 moles of the compound below, the mole ratio between the compound and Si is 2 : 4
- Given 5 moles of the compound below, the mole ratio between the compound and Ca is 5 : 20
- Given 3.5 moles of the compound below, the mole ratio between the compound and C is 1 : 1
Given the equation of the reaction below;
- Pb(NO₃)₂ (aq) + 2 KI (aq) --> PbI₂ (s) + 2 KNO₃ (aq)
the mole ratio of the reactants and products are as follows:
- Pb(NO₃)₂ : 2 KI (aq) = 1 : 2
- Pb(NO₃)₂ : PbI₂ (s0 = 1 : 1
- Pb(NO₃)₂ : 2 KNO₃ (aq) = 1 : 2
In conclusion, the mole ratio of reaction is the ratio in which moles of the substances combine.
Learn more about mole ratio at: brainly.com/question/19099163
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Answer: Water and oil cannot mix
Explanation:
Answer:
A
Explanation:
CO2 cylinder, 68% full by water capacity, warms up to room temperature (70 oF), the pressure inside the cylinder increases to 837 psi. When the same cylinder reaches 87.9 oF the entire charge becomes a gas no matter what the pressure.
