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3 years ago

Which phrase best defines radiant energy? (a)mechanical waves that require a medium to travel through

Chemistry

2 answers:

aleksklad [387]3 years ago

4 0

Answer:

D.) Energy transmitted by an electromagnetic wave.

Explanation:

In physics, and in particular as measured by radiometry, radiant energy is the energy of electromagnetic and gravitational radiation.

slava [35]3 years ago

3 0

Answer:

I think is b

Explanation:

if im wrong, heres some information:

mechanical wave is a wave that is an oscillation of matter, and therefore transfers energy through a medium.[1] While waves can move over long distances, the movement of the medium of transmission—the material—is limited. Therefore, the oscillating material does not move far from its initial equilibrium position. Mechanical waves transport energy. This energy propagates in the same direction as the wave. Any kind of wave (mechanical or electromagnetic) has a certain energy. Mechanical waves can be produced only in media which possess elasticity and inertia.

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Two linear hydrocarbons, Hexane (C6H14) and Heptane (C7H16), form pretty much an ideal solution at any composition. A solution i

Anettt [7]

Answer:

$y_{C_6H_{14}}=0.92$

Explanation:

Hello,

At first, we compute liquid-phase molar fractions:

$n_{C_6H_{14}}=463.96 g*\frac{1mol}{86g} =5.3949molC_6H_{14}\\n_{C_7H_{16}}=667.71 g*\frac{1mol}{100g} =6.6771molC_7H_{16}\\x_{C_6H_{14}}=\frac{5.3949}{5.3949+6.6771} =0.447\\x_{C_7H_{16}}=1-x_{C_6H_{14}}=0.553$

Now, by means of the fugacity concept, for hexane, for instance, we have:

$f_{C_6H_{14}}^V=f_{C_6H_{14}}^L\\y_{C_6H_{14}}p_T=x_{C_6H_{14}}p_{C_6H_{14}}$

In this manner, at 25 °C the vapor pressure of hexane and heptane are 0.198946 atm and 0.013912 atm repectively, thus, the total pressure is:

$p_T=x_{C_6H_{14}}p_{C_6H_{14}}+x_{C_7H_{16}}p_{C_7H_{16}}\\p_T=0.447*0.198946 atm +0.553*0.013912 atm=0.096622atm$

Finally, from the hexane's fugacity equation, we find its mole fraction in the vapour as:

$y_{C_6H_{14}}=\frac{x_{C_6H_{14}}p_{C_6H_{14}}}{p_T}=\frac{0.447*0.198946 atm}{0.096622atm} \\y_{C_6H_{14}}=0.92$

Best regards.

3 0

3 years ago

Read 2 more answers

What is the mass in grams of 0.2270 moles Au2O3

PtichkaEL [24]

Answer:

441.93 g/mol

Explanation:

mark me as BRAINLIST

7 0

3 years ago

The average cup of coffee contains about 125 mg of caffeine, C3H10N402. Caffeine is also found in tea, colas, and headache remed

slavikrds [6]

Answer:

ten atoms of hydrogen are present in one mole of caffeine.

Explanation:

Molecular formula of caffiene is given which is C3H10N4O2. It clearly shows that ten atoms of hydrogen are present. One mole is amount equal to one molecular weight of a molecule which is derived from molecular formula. So as moecular formula has ten atoms of hydrogen, one mole of caffeine has 10 atoms of hydrogen.

8 0

4 years ago

A pan containing 40 grams of water was allowed to cool from a temperature of 91 degrees C. If the amount of heat released is 130

liraira [26]

Answer:

Final temperature is 83.236 °C.

Explanation:

Let final temperature to be 'T'

There is a theorem :

ΔQ = m·s·ΔT

ΔQ : Heat exchange = -1300 J (<em>it is negative because heat is released</em>)

m : mass which exchanges heat = 40 grams

s : specific heat capacity of water = 4.186 J/grams °C = 1 Calories/grams °C

ΔT : Change in temperature = T - 91°

-1300 = 40 × 4.186 × (T-91)

$\mathrm{(T-91)=-\frac{1300}{40\times4.186}}$

$\mathrm{(T-91)\approx-7.764}$

$\mathbf{T\approx83.236 \ ^{0}C}$

3 0

3 years ago

Describe the life of a damselfly

Alborosie

Life Span. The life span of damselflies varies between species and within species depending on environmental factors. After one to three weeks, the eggs, laid in water, usually hatch, releasing the larvae or nymphs, but eggs laid in late summer may overwinter before hatching.

4 0

4 years ago