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svp [43]
3 years ago
15

Can someone help me out plz

Chemistry
1 answer:
rosijanka [135]3 years ago
5 0

Answer:

#2 you multiply the numbers

Explanation:

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Two systems with heat capacities 19.9 J mol-1 K-1 and 28.2 ] mol 1 K-1 respectively interact thermally and come to an equilibriu
MAVERICK [17]

Answer : The initial temperature of system 2 is, 19.415^oC

Explanation :

In this problem we assumed that the total energy of the combined systems remains constant.

-q_1=q_2

m\times c_1\times (T_f-T_1)=-m\times c_2\times (T_f-T_2)

The mass remains same.

where,

C_1 = heat capacity of system 1 = 19.9 J/mole.K

C_2 = heat capacity of system 2 = 28.2 J/mole.K

T_f = final temperature of system = 30^oC=273+30=303K

T_1 = initial temperature of system 1 = 45^oC=273+45=318K

T_2 = initial temperature of system 2 = ?

Now put all the given values in the above formula, we get

-19.9J/mole.K\times (303-318)K=28.2J/mole.K\times (303-T_2)K

T_2=292.415K

T_2=292.415-273=19.415^oC

Therefore, the initial temperature of system 2 is, 19.415^oC

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3 years ago
Is a hotdog a sandwich?
Elodia [21]

Answer:

yes

Explanation:

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How does the structure of covalent bonds affect the structure of the covalent compound?
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VSEPR theory , Valence bond theory and Molecular Orbital Theory
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Where did the mass of the forest trees come from?
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The mass of a tree is primarily carbon. The carbon comes from carbon dioxide used during photosynthesis. During photosynthesis, plants convert the sun's energy into chemical energy which is captured within the bonds of carbon molecules built from atmospheric carbon dioxide and water.
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Write a balanced molecular equation for the reaction of<br> sodiummetal with water.
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Answer:

Na + H₂O → NaOH + 1/2 H₂

Explanation:

When sodium reacts with water, it forms sodium hydroxide and molecular hydrogen. The unbalanced equation is:

Na + H₂O → NaOH + H₂

We have to balance this equation so it obeys the law of conservation of mass. We have 1 atom of Na on each side and 1 atom of O on each side, so these elements are balanced. However, we have 2 atoms of H on the left side and 3 atoms of H on the right side. The easiest way to balance the H without modifying the other elements is by making 1/2 the stoichiometric coefficient of H₂.

Na + H₂O → NaOH + 1/2 H₂

5 0
3 years ago
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