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timama [110]
3 years ago
14

The chemical symbol of sodium is​

Chemistry
1 answer:
ivolga24 [154]3 years ago
6 0

Answer:

Na

Explanation:

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Combustion vapor-air mixtures are flammable over a limited range of concentrations. The minimum volume % of vapor that gives a c
DochEvi [55]
Combustion equation of n-hexane:

2C₆H₁₄ + 19O₂ → 12CO₂ + 14H₂O

a)
Assuming we have 100 moles of air,
Oxygen = 20.9 moles
n-hexane required = 20.9/19 x 2
= 2.2 moles

LFL = Half of stoichometric amount = 2.2 / 2 = 1.1
LFL n-hexane = 1.1% 

b)
1.1 volume percent required for LFL

1.1% x 1
= 0.0011 m³ of n-hexane required
6 0
3 years ago
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The emission spectrum of hydrogen consists of several lines. Which line has the highest frequency?
solong [7]

Answer:

  410 nm

Explanation:

The highest frequency is associated with the shortest wavelength. Of those listed, 410 nm is the shortest.

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3 years ago
If a solution has a pH = 3, and another solution has a pH = 5, in terms of acidic strength, how many times weaker is the second
scoray [572]
I think they might have the answer online
3 0
3 years ago
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If I have 0.725 moles of gas at a temperature of 105 K and a pressure of 3.75 atmospheres, what is the volume of the gas?
iVinArrow [24]

If I have 0.725 moles of gas at a temperature of 105 K and a pressure of 3.75 atmospheres the volume of the gas 1.66 litres.

Explanation:

Data given:

number of moles of the gas = 0.725

temperature = 105 K

pressure = 3.75 atm

volume of the gas =?

R = 0.08206 Latm/mole Kelvin

Applying the ideal gas law to calculate the volume of the given gas:

PV = nRT

rearranging the equation to calculate volume:

V = \frac{nRT}{P}

putting the values in the equation:

V = \frac{0.08206 X 0.725 X 105}{3.75}

V = 1.66 Litres.

At a temperature of 105 K and pressure of 3.75 atm, 0.725 moles of gas occupy 1.66 litres of volume.

6 0
3 years ago
An ordered list of chemical substances is shown:
JulijaS [17]

Answer : The correct option is, (B) 2, 3 and 6.

Explanation :

Combustion reaction : It is a type of reaction where a hydrocarbon react with an oxygen molecule to give carbon dioxide, water as a product.

In general,

Hydrocarbon+O_2\rightarrow H_2O+CO_2

For example : Ethane react with oxygen to give carbon dioxide and water.

C_2H_8+4O_2\rightarrow 2CO_2+4H_2O

In the given list, O_2 is a reactant and CO_2,H_2O are the products.

Therefore, the correct answer is, (B) 2, 3, and 6

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3 years ago
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