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strojnjashka [21]
3 years ago
7

A chemical reaction gives off 2100 kg of heat energy how many calories

Chemistry
1 answer:
dlinn [17]3 years ago
7 0

The chemical reaction that gives off 2100 Kg of heat energy has 501.9126 calories


calculation

convert KJ to  calories

that is

          1 KJ  =  0.239006 calories

        2100KJ= ?  calories

by close multiplication

= (2100 kj  x 0.239006)÷ 1 kj  =501.9126 calories

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Which statement explains why water is classified
hichkok12 [17]

Answer: Option (1) is the correct answer.

Explanation:

Compounds are the substances which contain two or more different elements.

Similarly, water is a compound as it is made up when two hydrogen atoms combine with one oxygen atom. Compounds can be broken down with the help of chemical reactions.

Hence, the statement water can be broken down by chemical means explains why water is classified  as a compound.

5 0
2 years ago
Read 2 more answers
16. The concentration of a solution of potassium hydroxide is determined by titration with nitric
____ [38]

Answer:

M_{base}=0.709M

Explanation:

Hello,

In this case, since the reaction between potassium hydroxide and nitric acid is:

KOH+HNO_3\rightarrow KNO_3+H_2O

We can see a 1:1 mole ratio between the acid and base, therefore, for the titration analysis, we find the following equality at the equivalence point:

n_{acid}=n_{base}

That in terms of molarities and volumes is:

M_{acid}V_{acid}=M_{base}V_{base}

Thus, solving the molarity of the base (KOH), we obtain:

M_{base}=\frac{M_{acid}V_{acid}}{V_{base}} =\frac{0.498M*42.7mL}{30.0mL}\\ \\M_{base}=0.709M

Regards.

3 0
3 years ago
Plz help which this it is the digestive system
myrzilka [38]
I honestly have no clue on this one
8 0
2 years ago
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What is the limiting reagent when 49.84 g of nitrogen react with 10.7 g of hydrogen according to this balanced equation: n2(g) 3
Gennadij [26K]
Moles of nitrogen = 49.84 / 28 = 1.78
Moles of hydrogen = 10.7 / 2 = 5.35

Molar ratio of nitrogen to hydrogen = 1 : 3
Hydrogen required = 1.78 x 3 = 5.34

Therefore, hydrogen is in excess and nitrogen is the limiting reagent. 

8 0
3 years ago
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If you had 10.00 mL of acetic acid that you titrated with .100 M NaOH, and you used 45.15 mL of that base to get a light pink co
3241004551 [841]

Answer:

0.4515 M

Explanation:

In case of titration , the following formula can be used -

M₁V₁ = M₂V₂

where ,

M₁ = concentration of acid ,

V₁ = volume of acid ,

M₂ = concentration of base,

V₂ = volume of base .

from , the question ,

M₁ = ? M

V₁ = 10.0 mL

M₂ = 0.100 M

V₂ = 45.15 mL

Using the above formula , the molarity of acid , can be calculated as ,

M₁V₁ = M₂V₂

M₁ * 10.0mL = 0.100 M  * 45.15 mL  

M₁ = 0.4515 M

Hence, the concentration of the acetic acid = 0.4515 M

4 0
3 years ago
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