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3 years ago

What does it mean to say that the average daytime relative humidity of a particular city is 31 percent?

1 answer:

5 0

This means that the air in that city has less than a third of water vapor it could contain under the same circumstances. Relative humidity is the ratio of water vapor that the air contains to the maximum amount it could carry at the same temperature. When the humidity is high the water vapor in the air is a lot and vice versa.

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What is the answer to #4

Anna71 [15]

Weight has to do with how hard gravity is pulling on it. While mass is do to with the atoms in the matter.

7 0

4 years ago

Identify four forms of energy in the following diagram

Mariana [72]

Answer:

Chemical, electrical, thermal, & radiant

Explanation:

A battery is a device that stores chenical energy and converts it to electricity. The diagram portrays said electricity powering an incandescent light bulb, which work by using an electrical current to heat a filament until light is produced.

6 0

3 years ago

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The combustion of liquid methanol has a change in enthalpy of -1278 kJ. How much energy will you get from burning 245.0 g of met

Nookie1986 [14]

Answer : 9773 kJ

Explanation:

Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and $\Delta H$ for the reaction comes out to be negative.

To calculate the moles :

$\text{Moles of solute}=\frac{\text{given mass}}{\text{Molar Mass}}$

$\text{Moles of methanol}=\frac{245.0g}{32.04/mol}=7.647moles$

Given : Change in enthalpy on combustion of 1 mole of methanol = -1278 kJ

According to stoichiometry :

1 mole of methanol produce energy = 1278 kJ

Thus 7.647 moles of methanol produce energy = $\frac{1278}{1}\times 7.647=9773kJ$

Thus 9773 kJ of energy is produced from burning 245.0 g of methanol in excess oxygen

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3 years ago

If the density of pure water is 0.9922 g/mL at 40 ºC, calculate its theoretical molarity at that temperature. Report to 4 sig fi

OleMash [197]

Answer is: theoretical molarity of water is 55.1222 mol/L.<span>
d(H</span>₂O) = 0.9922 g/mL.
M(H₂O) = 2 · Ar(H) + Ar(O) · g/mol.
M(H₂O) = 2 + 16 · g/mol = 18 g/mol.
c(H₂O) = d(H₂O) ÷ M(H₂O).
c(H₂O) = 0.9922 g/mL ÷ 18 g/mol.
c(H₂O) = 0.0551 mol/mL.
c(H₂O) = 0.0551 mol/mL · 1000 mL/L = 55.1222 mol/L.

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4 years ago

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harina [27]

Answer:

answer in picture

Explanation:

7 0

3 years ago

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