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OverLord2011 [107]
3 years ago
8

Wood burns in the presence of oxygen in the air and produces fire. After all the wood is burned, the fire stops. What is the exc

ess reactant?
Chemistry
1 answer:
worty [1.4K]3 years ago
4 0

Answer:

oxygen

Explanation:any reaction with burning involves mixing oxygen

this is correct

hope this helps plzz mark me brainliest  

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A gaseous mixture consisting of nitrogen, argon, and oxygen is in a 3.5-L vessel at 25C. Determine the number of moles of oxygen
Step2247 [10]

Answer:

Number of moles of oxygen = 0.037  mol

Explanation:

Given data:

Total pressure = 98.5 KPa

Partial pressure of nitrogen = 22.0 KPa

Partial pressure of argon = 50.0 KPa

Volume = 3.5 L

Temperature = 25°C (25+273= 298K)

Number of moles of oxygen = ?

Solution:

Total pressure = P(N₂) + P(O₂) + P(Ar)

98.5 KPa = 22.0 KPa +P(O₂) + 50.0 KPa

98.5 KPa = 72.0 KPa +P(O₂)

P(O₂)  = 98.5 KPa - 72.0 KPa

P(O₂)  = 26.5 KPa

KPa to atm:

26.5 KPa/ 101 = 0.262 atm

Number of moles of oxygen:

PV = nRT

n = PV/RT

n = 0.262 atm × 3.5 L / 0.0821 atm.L/mol.K  × 298 K

n = 0.917atm.L /24.47atm.L/ mol

n = 0.037  mol

6 0
2 years ago
Calculate the moles and grams of solute in 2.0 L of 0.30M Na SO..
Ostrovityanka [42]

Answer:

Number of moles of solute = 0.6 mole

Mass =13.8 g

Explanation:

Given data:

Number of moles of sodium = ?

Volume = 2.0 L

Molarity = 0.30 M

Mass in gram of sodium= ?

Solution:

<em>Number of moles:</em>

Molarity = number of moles of solute / volume in litter

Number of moles of solute = Molarity × volume in litter

Number of moles of solute = 0.30 M × 2.0 L

Number of moles of solute = 0.6 mole

<em>Mass in gram:</em>

Mass = Number of moles × molar mass

Mass = 0.6 mole× 23 g/mol

Mass =13.8 g

3 0
3 years ago
The number of particles in one mole of a substance is:
spayn [35]
Avogadros number is the answer
3 0
3 years ago
Which statement is true regarding sexual reproduction as a method of producing offspring?
DerKrebs [107]

The answer is D, I hope this helps!

8 0
3 years ago
Read 2 more answers
An acetylene tank has a volume of 390.0 L. It is stored at a temperature of 23.5 °C and has a
xeze [42]

Considering the ideal gas law,  there are 279.42 moles of acetylene in the tank.

<h3>Definition of ideal gas</h3>

Ideal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.

<h3>Ideal gas law</h3>

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of gases:

P×V = n×R×T

<h3>Moles of acetylene</h3>

In this case, you know:

  • P= 1765 kPa= 17.4192 atm (being 101.325 kPa= 1 atm)
  • V= 390 L
  • n= ?
  • R= 0.082 \frac{atmL}{molK}
  • T= 23.5 °C= 296.5 K (being 0 °C= 273 K)

Replacing in the ideal gas law:

17.4192 atm× 390 L = n×0.082 \frac{atmL}{molK}× 296.5 K

Solving:

n=\frac{17.4192 atmx 390 L}{0.082 \frac{atmL}{molK}x296.5 L}

<u><em>n= 279.42 moles</em></u>

Finally, there are 279.42 moles of acetylene in the tank.

Learn more about ideal gas law:

brainly.com/question/4147359

4 0
2 years ago
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