Need help ASAP !!

How much energy (kJ) is required to change 0.18 mole of ice (s) at 0 C to water (l) at 0 C?

Dmitriy789 [7]

Answer:25,06 kJ of energy must be added to a 75 g block of ice.

ΔHfusion(H₂O) = 6,01 kJ/mol.

T(H₂O) = 0°C.

m(H₂O) = 75 g.

n(H₂O) = m(H₂O) ÷ M(H₂O).

n(H₂O) = 75 g ÷ 18 g/mol.

n(H₂O) = 4,17 mol.

Q = ΔHfusion(H₂O) · n(H₂O)

Q = 6,01 kJ/mol · 4,17 mol

Q = 25,06 kJ.

Explanation:

6 0

3 years ago

2) If 100.0 J of heat are added to 20.0 g of water at 30.0°C, what will be the final

anzhelika [568]

The final temperature of the water will be 31.2 °C... i don’t know the second one sorry :(

3 0

3 years ago

Need a bit of help with this. Fill in the coefficients, explain your answer.

sp2606 [1]

Answer:

4Fe + 3O₂ → 2Fe₂O₃

General Formulas and Concepts:

Chemistry - Reactions

Balancing Reactions

Explanation:

Step 1: Define

RxN: Fe + O₂ → Fe₂O₃

Step 2: Balance

We need to balance both Fe and O.

LCM of 2 and 3 is 6:

Fe + 3O₂ → 2Fe₂O₃

We now need the same amount of Fe on both sides:

4Fe + 3O₂ → 2Fe₂O₃

4 0

3 years ago

Atoms are incredibly small and we cannot see them, even with very powerful microscopes. If we cannot see them, then how do we kn

Alekssandra [29.7K]

Albert Einstein showed in one of his papers in 1905 that Brownian motion could be explained by assuming that matter is made up of tiny particles. His paper predicted how the motion should look like and also allowed for the calculation of the mass of a single molecule. Current evidence includes: 1. Individual ions (atoms with an electric charge) can be manipulated using electric and magnetic fields. 2. Elevation maps can now be made that show bumps caused by individual atoms.

3 0

4 years ago

Magsulat sa iyong sailing lyrics na kanta the tune of meron leron sinta

xxMikexx [17]

Answer:

I am sailing

Home again

'Cross the sea

I am sailing

Stormy waters

To be near you

To be free

I am flying

Like a bird

'Cross the sky

I am flying

Passing high clouds

To be with you

To be free

Can you hear me, can you hear me

Through the dark night, far away

I am dying, forever crying

To be with you, who can say

Can you hear me, can you hear me

Through the dark night far away

I am dying, forever crying

To be with you, who can say

We are sailing, we are sailing

Home again

'Cross the sea

We are sailing

Stormy waters

To be near you

To be free

Oh Lord, to be near you, to be free

Oh Lord

Explanation:

I hope this is the right one

3 0

3 years ago