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slavikrds [6]
3 years ago
15

Which substance has Hf defined as 0 kJ/mol?

Chemistry
1 answer:
Elina [12.6K]3 years ago
5 0
Co i belive. what are the options?

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How much heat is required to change temperature of 2g of water from 34°C to 68°C? (Water has a specific heat of 4.18)
statuscvo [17]

Answer: B

Explanation:

To find the amount of heat required, you would use q=mcΔT.

q=2g(4.18J/g°C)(68-34°C)

q=284.2 J

*Please ignore the capital A in the equation. I can't find a way to type in the degree sign into the equation without the A appearing.

4 0
3 years ago
How many carbon atoms will be in the longest chain of 2,2,4-trimethylpentane
FrozenT [24]

The carbon atoms that will be in the longest chain of 2, 2, 4 – trimethyl pentane is 5. There are 5 carbons in the longest chain that forms a cross.

<span>Hope this helps you with your question. Don’t hesitate to ask here in Brainly.</span>

6 0
3 years ago
if the mass of a box was 400 grams, and the length is 2cm the width is 2cm and the height is 1cm. what is the density?
oksano4ka [1.4K]

Answer:

The density of the box is 6.25g/cm³

Explanation:

400 ÷ 4³ = 6.25

4 0
3 years ago
What substance takes part in an enzymatic reaction, but is unchanged by the reaction?
Ierofanga [76]
The answer to this question would be: enzyme 

<span>Enzyme is a kind of catalyst that </span>will take part in the chemical reaction but it won't be reacted. E<span>nzyme </span>only helps by reducing the energy needed to start the reaction.
Theoretically, the enzyme is not mandatory needed but if you have an enzyme the reaction will be easier, thus increasing reaction speed. But in most case, the reaction might be too slow without enzyme, making enzyme vital in living organism.
5 0
3 years ago
When 3.0 mol Al react with 7.0 mol HCl, what is the limiting reactant and how many moles of H2 can be formed?
inysia [295]
HCl is the limiting reactant, and 3.5 mol H2<span> can be formed</span>
6 0
3 years ago
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