Answer:
2 moles of KOH are required.
Explanation:
Given data:
Moles of MgCl₂ = 1 mol
Number of moles of KOH react with MgCl₂ = ?
Solution:
Chemical equation:
MgCl₂ + KOH → Mg(OH)₂ + KCl
Balanced chemical equation:
MgCl₂ + 2KOH → Mg(OH)₂ + 2KCl
From balance chemical equation it can be seen when one mole of MgCl₂ react then 2 moles of KOH are required. It means double quantity of KOH is react with MgCl₂ in order to produced one mole of Mg(OH)₂ and 2 moles of KCl.
The above reaction also completely follow the la of conservation mas mass because there are equal number of atoms of reactant and products on both side of chemical equation.
The initial momentum of the boy is 0 kgm/s the right option is A. 0 kgm/s.
<h3>What is momentum?</h3>
Momentum can be defined as the product of mass and velocity. The S.I unit of momentum is kgm/s.
The initial momentum of the boy can be calculated using the formula below.
Formula:
Where:
- M = Initial momentum of the boy
From the question,
Given:
- M = mass of the boy = 60 kg
- U = Initial velocity of the boy = 0 m/s (at rest)
Substitute these values into equation 1
Hence, The initial momentum of the boy is 0 kgm/s the right option is A. 0 kgm/s.
Learn more about momentum here: brainly.com/question/7538238
Answer:
To make this easier I'll label the left column 1, 2, 3, and 4. and the right column A, B, C, and D.
1 goes to B
2 goes to A
3 goes to C
4 goes to D
Explanation:
1. A ship goes out of sight on the horizon because it goes too far around the curve of the earth to see anymore.
2. We have day and night because the earth spins certain sides of itself to face the sun and other sides to face away from the sun (aka day and night)
3. We have summer and winter because Earth's axis is tilted. Part of the Earth tilts closer to the sun when summer is here, and the other part tilts away from the sun when it's winter. (This is why it's summer in North America, when it's winter in Australia).
4. A year is measured by how long it takes a planet to orbit it's star. A year for Earth is 365 days because it takes 365 days for earth to orbit around the sun.
Hi! the english version of the given question is "A helium balloon is inflated to the volume of 0.045 m3 at a temperature of 2 ° C. If the balloon is cooled to -12 ° C. What will its new volume be? Consider that the pressure does not vary". The answer is given in english.
Answer:
The new volume of balloon is .
Explanation:
Let's assume the helium gas inside the balloon behaves ideally.
The total number of moles of helium gas inside the balloon remains constant.
Applying combined gas law, we get:
Where:
are the initial and final pressure of the balloon respectively.
are the initial and final volume of the balloon respectively.
are the initial and final temperature in the kelvin scale respectively.
Given:
Substituting the above values, we get:
Answer:
the pressure (torr) of theH₂ gas is 736.2 torr
Explanation:
Given that
The H₂ gas produced in a chemical reaction is collected through water in a eudiometer; during this process, the gas collected contains some droplets of water vapor along with these gas.
So; the total pressure in the eudiometer = Pressure in the H₂ gas - Pressure of the water vapor
Where;
= total pressure in the eudiometer = 760.0 torr
= Pressure in the H₂ gas = ???
= Pressure in the water vapor = 23.8 torr
Now:
= +
- = + -
= - +
= (- 23.8 + 760) torr
= 736.2 torr
Thus; the pressure (torr) of theH₂ gas is 736.2 torr