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3 years ago

Why do fire fighters use oxygen gas tank?

2 answers:

6 0

When firefighters are spending a long time in high heat conditions, they will experience an increase in the temperature of the air coming from the regulator.Pure oxygen is the last thing they want to be carrying around when they are fighting a fire.

Aleonysh [2.5K]3 years ago

3 0

SCBA tanks use regular air, not pure oxygen. Modern SCBA cylinders are carbon fiber wrapped aluminum. They do get hot under high temperature conditions. But, the most common ones today are tested to 6000 PSI, and filled to 4500. This gives them some buffer for increase in pressure due to heating. Furthermore, any increase in pressure from heat is usually offset by the rapid release of air as we breathe the tank down. Firefighting is heavy, hot, difficult work, and a tank of air usually lasts about 2/3 of what it states on the label.

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Which is the limiting reagent in the following reaction given that you start with 15.5 g of Na2S and 12.1 g CuSO4? Reaction: Na2

NemiM [27]

Answer:

CuSO4

Explanation:

Na2S + CuSO4 → Na2SO4 + CuS

The reaction is balanced (same number of elements in each side)

To determine limiting reagent you need to know the moles you have of each.

Molar mass Na2S = 23 * 2 + 32 = 78

Molar mass CuSO4 = 63.5 + 32 + 16 * 4 = 159.5

Na2S mole = 15.5 / 78 = 0.2

CuSO4 mole = 12.1/159.5 = 0.076

*Remember mole = mass / MM

With that information now you have to divide each moles by its respective stoichiometric coefficient

Na2S stoichiometric coefficient : 1

Na2S : 0.2 / 1 = 0.2

CuSO4 stoichiometric coefficient: 1

CuSO4: 0.076 / 1 = 0.076

The smaller number between them its the limiting reagent, CuSO4

8 0

4 years ago

Which statement is correct with respect to gross primary productivity

bezimeni [28]

Gross primary production and net primary production. Gross primary production is the amount of chemical energy as biomass that primary producers create in a given length of time.

8 0

3 years ago

Which of the following is the correct definition of chemical energy?

Anna11 [10]

Answer:

Explanation:

energy stored in chemical bonds of molecules

5 0

3 years ago

Read 2 more answers

Like Earth, the moon

dedylja [7]

Um all? i’m confused

5 0

3 years ago

What is the specific heat of a substance that absorbs 2500 joules of heat when a sample of 100g of the substance increases in te

Ierofanga [76]

Answer:

0.417 J/gºC

Explanation:

From the question given above, the following data were obtained:

Heat (Q) absorbed = 2500 J

Mass (M) of substance = 100 g

Initial temperature (T1) = 10 °C

Final temperature (T2) = 70 °C

Specific heat capacity (C) =?

Next, we shall determine the change in temperature (ΔT). This can be obtained as follow:

Initial temperature (T1) = 10 °C

Final temperature (T2) = 70 °C

Change in temperature (ΔT) =?

Change in temperature (ΔT) = T2 – T1

Change in temperature (ΔT) = 70 – 10

Change in temperature (ΔT) = 60 °C

Finally, we shall determine the specific heat capacity of the substance as follow:

Heat (Q) absorbed = 2500 J

Mass (M) of substance = 100 g

Change in temperature (ΔT) = 60 °C

Specific heat capacity (C) =?

Q = MCΔT

2500 = 100 × C × 60

2500 = 6000 × C

Divide both side by 6000

C = 2500 / 6000

C = 0.417 J/gºC

Therefore, the specific heat capacity of substance is 0.417 J/gºC

5 0

3 years ago