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3 years ago

What is the first thing you notice about a person? .-_-

Chemistry

2 answers:

Ilia_Sergeevich [38]3 years ago

7 0

Answer:

Their smile, I don't know why my eyes just go straight to teeth

Kobotan [32]3 years ago

5 0

Answer:

How they act and if they are thre type of people I could hangout with !

Explanation:

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A balloon filled with air has a volume of 0.500 L at 25.0 ºC and an internal pressure of 1.20 atm. What will the volume of the b

Alex_Xolod [135]

Answer:

0.441 L

Explanation:

At constant pressure, Using Charle's law :-

$\frac {V_1}{T_1}=\frac {V_2}{T_2}$

Given ,

V₁ = 0.500 L

V₂ = ?

T₁ = 25.0 °C

T₂ = -10.0 °C

The conversion of T( °C) to T(K) is shown below:

T(K) = T( °C) + 273.15

So,

T₁ = (25 + 273.15) K = 298.15 K

T₂ = (-10 + 273.15) K = 263.15 K

Using above equation as:

$\frac{0.500}{298.15}=\frac{V_2}{263.15}$

$V_2=\frac{0.500\cdot \:263.15}{298.15}$

<u>New volume = 0.441 L</u>

4 0

3 years ago

Hydrogen, a potential future fuel, can be produced from carbon (from coal) and steam by the following reaction: C(s)+2H2O(g)→2H2

madam [21]

The question is incomplete , complete question is:

Hydrogen, a potential future fuel, can be produced from carbon (from coal) and steam by the following reaction:

$C(s)+ 2 H_2O(g)\rightarrow 2H_2(g)+CO_2(g).\Delta H=?$

Note that the average bond energy for the breaking of a bond in CO2 is 799 kJ/mol. Use average bond energies to calculate ΔH of reaction for this reaction.

Answer:

The ΔH of the reaction is -626 kJ/mol.

Explanation:

$C(s)+ 2 H_2O(g)\rightarrow 2H_2(g)+CO_2(g).\Delta H=?$

We are given with:

$\Delta H_{H-O}=459 kJ/mol$

$\Delta H_{H-H}=432 kJ/mol$

$\Delta H_{C=O}=799 kJ/mol$

ΔH = (Energies required to break bonds on reactant side) - (Energies released on formation of bonds on product side)

$\Delta H=(4\times \Delta H_{O-H})-(2\times \Delta H_{H-H}+2\times\Delta H_{C=O})$

$=(4\times 459 kJ/mol)-(2\times 432 kJ/mol+2\times 799 kJ/mol$

$\Delta H=-626 kJ/mol$

The ΔH of the reaction is -626 kJ/mol.

5 0

4 years ago

Which of the following is part of the molarity equation?

Zinaida [17]

Answer:

Moles of Solution

4 0

2 years ago

Which of the following explains why salt water is considered a mixture

Svet_ta [14]

Answer:

sal5 water = kaka

Explanation:

because i need points ty man

7 0

3 years ago

Which of the following equations is balanced correctly?

alekssr [168]

B)2c3h3 +o2-2co2+h2o(balanced)

6 0

4 years ago