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2 years ago

7

Both the National Fire Academy and Iowa formulas calculate the flow requirement for structures that are __________ percent invol

ved in flame.

1 answer:

emmainna [20.7K]2 years ago

7 0

Answer:

100

Explanation:

You might be interested in

How many moles of O2 are needed to react completely with 35.0 mol C2h2

Wittaler [7]

Hey There!:

2 C2H2 + 5 O2 = 4 CO2 + 2 H2O

2 moles C2H2 ----------- 5 moles O2

35.0 moles C2H2 ------- moles O2

moles O2 = 35.0 * 5 / 2

moles O2 = 87.5 moles

hope this helps!

6 0

3 years ago

The addition of 250.0 J to 30.0 g of copper initially at 22.0°C will change its temperature to what final value? (Specific heat

WINSTONCH [101]

Answer:

Final temperature = $43.53^{\circ} C$

Explanation:

Given that,

Heat added, Q = 250 J

Mass, m = 30 g

Initial temperature, T₁ = 22°C

The Specific heat of Cu= 0.387 J/g °C

We know that, heat added due to the change in temperature is given by :

$Q=mc\Delta T\\\\Q=mc(T_2-T_1)\\\\\dfrac{Q}{mc}=(T_2-T_1)\\\\T_2=\dfrac{Q}{mc}+T_1$

Put all the values,

$T_2=\dfrac{250}{30\times 0.387}+22\\\\=43.53^{\circ} C$

So, the final temperature is equal to $43.53^{\circ} C$ .

8 0

3 years ago

Atoms that differ only in the number of neutrons are called:

Natali [406]

The answer is C. Isotopes.

Isotopes are defined as two substances that have the same number of protons and electrons, but a different number of neutrons, and therefore a different atomic mass. For example, carbon-12 and carbon-14 are isotopes of each other.

Hope this helps!

8 0

3 years ago

Read 2 more answers

Gas has a volume of 247.3 ML and is at 100 Celsius and 745 Hg. If the mass of the gas is 0.347 g what is the molar mass of the v

Ahat [919]

Answer:

The molar mass of the vapor is 43.83 g/mol

Explanation:

Given volume of gas = V = 247.3 mL = 0.2473 L

Temperature = T = 100 $^{\circ}C$ = 373 K

Pressure of the gas = P = 745 mmHg (1 atm = 760 mmHg)

$P = \displaystyle \frac{745}{760} \textrm{ atm} = 0.9802 \textrm{ atm}$

Mass of vapor = 0.347 g

Assuming molar mass of gas to be M g/mol

The ideal gas equation is shown below

$\textrm{PV} =\textrm{nRT} \\\textrm{PV} = \displaystyle \frac{m}{M}\textrm{ RT } \\0.98026 \textrm{ atm}\times 0.2473 \textrm{ L} = \displaystyle \frac{3.47 \textrm{ g}}{M}\times 0.0821 \textrm{ L.atm.mol}^{-1}.K^{-1}\times 373\textrm{K} \\M = 43.834 \textrm{ g/mol}$

The molar mass of the vapor comes out to be 43.834 g/mol

4 0

3 years ago

Which of the following statements is FALSE? Which of the following statements is FALSE?

KATRIN_1 [288]

Answer: option A) Mixtures may be composed of two or more elements, two or more compounds, or a combination of both.

Explanation:

A mixture is a combination of two or more substances mixed together and can be separated by physical methods.

A combination of two elements or compounds will yield chemical compounds NOT a mixture.

Thus, option A is false statement

3 0

3 years ago