__C8H18(I) + __ O2(g) —> __Co2(g) + __H2O(g) Balance out the equation

A pair of students found the temperature of 100. g of water to be 26.5°C. They then dissolved 8.89 g of AgNO3 in the water. When

bekas [8.4K]

Explanation:

Initial temperature of the water = $T_i=26.5^oC$

Final temperature of the water = $T_f=23.7^oC$

a) Change in temperature of the water,ΔT = $T_f-T_i$

$\Delta T=23.7^oC-26.5^oC=-2.8^oC$

Change in temperature of the water,ΔT is -2.8°°C.

b) Endothermic reaction : Reaction in which heat absorbed and the temperature if the surrounding is decreased.

Exothermic reaction : Reaction in which heat released and the temperature if the surrounding is increased.

On dissolving silver nitrate in water the temperature of the water decreased 2.8 degree Celsius which means that energy water was absorbed by solid silver nitrate to get dissolve in water. Hence, endothermic reaction.

(f) Mass of silver nitrate = 8.89 g

Moles of silver nitrate = $\frac{8.89 g}{170 g/mol}=0.05229 mol$

$AgNO_3(aq)\rightarrow Ag^+(aq)+NO_3^-(aq)$

1 mole of silver nitrate gives 1 mole of silver ion i.e. cation.

Then 0.05229 moles of silver nitrate will give:

$\frac{1}{1}\times 0.05229 mol=0.05229 mol$ silver ions.

0.05229 moles of cations are produced.

1 mole of silver nitrate gives 1 mole of nitrate ion i.e. anion .

Then 0.05229 moles of silver nitrate will give:

$\frac{1}{1}\times 0.05229 mol=0.05229 mol$ nitrate ions.

0.05229 moles of anion are produced.

5 0

2 years ago

Which solution below yields the lowest final concentration of a sodium hydroxide solution prepared by diluting 50.00 mL of conce

Firdavs [7]

Answer:

The answer to your question is: letter D. 1.33 L

Explanation:

Data

V1 = 50 ml

C1 = 19.3

To solve this problem use the formula C₁V₁ = C₂V₂

C2 = C1V1 / V2

C = concentration

V = volume

a) 1.15 L

C2 = (19.3)(50) / 1150

C2 = 0.84 M

b) No right answer

c) V2= 0.80 L

C2 = (19.3)(50) / 800

C2 = 1.2 M

d) V2 = 1.33 L

C2 = (19.3)(50) / 1330

C2 = 0.72 M

e) V2 = 350 ml

C2 = (19.3)(50) / 350

C2 = 2.75 M

3 0

3 years ago

An element has atomic number 10 and an atomic mass of 20. How many neutrons are in the atom of this element?

Igoryamba

The answer is A. 10.

3 0

3 years ago

Why is the structure of a molecule important to its function

Scilla [17]

Answer:

It determines how biological molecules recognize and respond to one another with specificity.

Explanation:

A molecule has a characteristic size and shape. The precise shape of a molecule is usually very important to its function in the living cell. Molecular shape is crucial in biology because it determines how biological molecules recognize and respond to one another with specificity.

3 0

3 years ago

Can somebody plz answer this question only in 1-2 sentences! That would be great thanks so much :)

lbvjy [14]

Pure substances are substances which are homogenous in nature. They either consists of atoms of 1 kind or molecules of 1 kind. Atoms are seen in elements, where as molecules are seen in compounds like Acids, Bases, etc.

They mostly have fixed properties like boiling and melting points and are uniform in nature. :D

4 0

2 years ago