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3 years ago

_________ refers to the total energy of a system.

Chemistry

2 answers:

makkiz [27]3 years ago

6 0

Answer: a. Enthalpy

Explanation:

inna [77]3 years ago

3 0

Enthalpy refers to the total energy of a system. Hope this helped!

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Lymph nodes are...

MrMuchimi

Answer:

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3 years ago

Why cant fungi make there own food using photosynthesis

dangina [55]

Fungi cannot make their food from sunlight, water and carbon dioxide as plants do, in the process known as photosynthesis

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3 years ago

Methylamine (ch3nh2) is a weakly basic compound. calculate the kb for methylamine if a 0.253 m solution is 4.07% ionized.

MariettaO [177]

Answer is: Kb for methylamine is 4.37·10⁻⁴.
Chemical reaction: CH₃NH₂ + H₂O → CH₃NH₃⁺ + OH⁻.
c(CH₃NH₂) = 0.253 M.
α = 4.07% ÷ 100% = 0.0407.
[CH₃NH₃⁺] = [OH⁻] = c(CH₃NH₂) · α.
[CH₃NH₃⁺] = [OH⁻] = 0.253 M · 0.0407.
[CH₃NH₃⁺] = [OH⁻] = 0.0103 M.
[CH₃NH₂] = 0.253 M - 0.0103 M.
[CH₃NH₂] = 0.2427 M.
Kb = [CH₃NH₃⁺] · [OH⁻] / [CH₃NH₂].
Kb = (0.0103 M)² / 0.2427 M.
Kb = 4.37·10⁻⁴.

8 0

3 years ago

What does matter have besides mass.

Vika [28.1K]

Answer:

so like Each of the five states of matter collectively made up all the "stuff" that's in the universe- — everything that takes up space and has mass is matter,and All matter is made up of atoms and in turn made up of protons and neutrons and electrons.

Explanation: hope this helps

7 0

2 years ago

How many grams of NaCL are required to prepare 50ml of a 2.0 molar solution

Ksivusya [100]

Answer:

5.85 gm.

Explanation:

We know that,

Normality = Molarity × Molecular weight

Equivalent weight

Since molecular weight of NaCl= equivalent weight = 23+35.5 =58.5

Normality of NaCl= molarity=2

Now,

Normality= weight in gram ×1000

Volume ×equivalent weight

Weight in gram is given by,

=Normality × Volume × equivalent weight

1000

= 2× 50 × 58.5

1000

=5.85 gm.

4 0

3 years ago