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boyakko [2]
3 years ago
8

The combustion of propane may be described by the chemical equation C 3 H 8 ( g ) + 5 O 2 ( g ) ⟶ 3 CO 2 ( g ) + 4 H 2 O ( g ) C

3H8(g)+5O2(g)⟶3CO2(g)+4H2O(g) How many grams of O 2 ( g ) O2(g) are needed to completely burn 19.7 g C 3 H 8 ( g ) ?
Chemistry
1 answer:
Kipish [7]3 years ago
7 0

Answer: 72 grams of O_2(g) are needed to completely burn 19.7 g C_3H_8(g)

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to molecular mass and contains avogadro's number 6.023\times 10^{23} of particles.

To calculate the number of moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Putting in the values we get:

\text{Number of moles}=\frac{19.7g}{44g/mol}=0.45moles

C_3H_8(g)+5O_2(g)\rightarrow 3CO_2(g)+4H_2O(g)

According to stoichiometry:

1 mole of C_3H_8 requires 5 moles of oxygen

0.45 moles of C_3H_8 require= \frac{5}{1}\times 0.45=2.25 moles of oxygen

Mass of O_2=moles\times {\text {Molar mass}}=2.25\times 32=72g

72 grams of O_2(g) are needed to completely burn 19.7 g C_3H_8(g)

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Korolek [52]

Answer: Option (c) is the correct answer.

Explanation:

When current passes through a wire then a magnetic field is formed. Therefore, when two wires carry current in the same direction then both the wires with have respective magnetic fields in the same direction and their total magnetic field will be large.

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4 0
3 years ago
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What term describes how much energy it takes to change the temperature of a substance? It is fill in the blank not multiple choi
vova2212 [387]

Heat capacity

Explanation:

The heat capacity is the energy required to raise the temperature of a substance.

With the value of this amount of heat known, we can know the amount of heat that will cause a particular temperature change when added or removed from a substance .

  • Heat capacity is a function of mass and specific heat capacity of a body
  • The specific heat capacity measures the amount of heat required to the raise the temperature of 1g of a substance by 1°C or 1K
  • Different substances have different specific heat capacities and hence will require various amount of heat to change their temperature.
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Learn more:

Heat capacity brainly.com/question/7139767

#learnwithBrainly

6 0
3 years ago
A child has a toy balloon with a volume of 1.80 liters. The temperature of the balloon when it was filled was 20° C and the pres
kiruha [24]

Answer:

The new volume of the balloon is 2.422 liters.

Explanation:

Let suppose that gas inside the balloon behaves ideally. From the Equation of State for Ideal Gases, we know that pressure (P), in atmospheres, is inversely proportional to volume (V), in liters, and directly proportional to temperature (T), in Kelvin. Based on this fact, we construct the following relationship:

\frac{P_{1}\cdot V_{1}}{T_{1}} = \frac{P_{2}\cdot V_{2}}{T_{2}} (1)

Where:

P_{1}, P_{2} - Initial and final pressures, in atmospheres.

V_{1}, V_{2} - Initial and final volumes, in liters.

T_{1}, T_{2} - Initial and final temperatures, in Kelvin.

If we know that P_{1} = 1\,atm, V_{1} = 1.80\,L, T_{1} = 293.15\,K, P_{2} = 0.667\,atm, T_{2} = 263.15\,K, then the final pressure is:

V_{2} = V_{1} \cdot \left(\frac{P_{1}}{P_{2}} \right)\cdot \left(\frac{T_{2}}{T_{1}} \right)

V_{2} = 2.422\,L

The new volume of the balloon is 2.422 liters.

8 0
2 years ago
In the lab, a student measures a cube of copper to be 2.25 cm on a side. What is the volume of the cube, with the correct number
Gemiola [76]

Answer:

11.39 cm³

Explanation:

22.5³=11.39 (4 s.f.)

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