When 10 grams of copper and 10 grams of iodine are mixed, what is the
2 answers:
Answer:
15 grams
Explanation:
Mass of Cu = 10 g
Molar mass of Cu = 63.546 g/mol
Moles of Cu = = 0.1574
Mass of I₂ = 10 g
Molar mass of I₂ = 253.8 g/mol
Moles of I₂ = = 0.04
I₂ here is the limiting reactant as it has the least number of moles.
Based on the balanced equation,
1 mole of I₂ = 2 moles of CuI
0.04 mole of I₂ = 0.08 moles of CuI
Molar mass of CuI = 190.45 g/mol
Mass of CuI = 0.08 moles x 190.45 g/mol = 15.236 g
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Answer: The amount of carbon-14 left after 10 years is 25 g
Explanation:
Formula used :
where,
a = amount of reactant left after n-half lives = ?
= Initial amount of the reactant = 100 g
n = number of half lives =
Putting values in above equation, we get:
Therefore, the amount of carbon-14 left after 10 years is 25 g
Answer:
The new temperature will be 565.83 K.
Explanation:
Gay Lussac's law establishes the relationship between the temperature and the pressure of a gas when the volume is constant. This law says that the pressure of the gas is directly proportional to its temperature. This means that if the temperature increases, the pressure will increase; or if the temperature decreases, the pressure will decrease.
In other words, Gay-Lussac's law states that when a gas undergoes a constant volume transformation, the ratio of the pressure exerted by the gas temperature remains constant:
When an ideal gas goes from a state 1 to a state 2, it is true:
In this case:
- P1= 180 kPa
- T1= 291 K
- P2= 350 kPa
- T2= ?
Replacing:
Solving:
T2= 565.83 K
<u><em>The new temperature will be 565.83 K.</em></u>
Answer:
3.6 × 10²⁴ atoms of O
Explanation:
Let's consider the molecular formula of silver nitrate: AgNO₃.
We can establish the following relations:
- 1 mol of AgNO₃ has 6.02 × 10²³ molecules of AgNO₃ (Avogadro's number).
- 1 molecule of AgNO₃ has 3 atoms of oxygen.
The atoms of oxygen in 2.0 moles of silver nitrate are: