An example of two class b fuels would be

kumpel [21]

The distance from the star to the Earth

Explanation:

The absolute brightness of a star is a measure of the intrinsec luminosity of the star, i.e. it does not depend on the distance of the star from the Earth.

In other word, the absolute brightness is a measure of the luminosity of a star if all stars were placed at the same distance from Earth.

On the other hand, the relative brightness of a star is a measure of its luminosity as observed on Earth, therefore it does depend on the distance of the star from the Earth: the farther the star is, the more its luminosity will decrease, and vice-versa.

The star's absolute brightness, therefore, depends only on the characteristics of the star itself, namely:

- The absolute magnitude of the star

- The rate at which the star produces energy via nuclear fusion

- The rate at which the star releases energy via electromagnetic radiation

Therefore, the only factor that does NOT change if the absolute brightness of a star changes is

- The distance from the star to the Earth

Learn more about planets and stars:

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8 0

3 years ago

What is the mass in grams of 9.45*10^24 molecules of methanol (CH3OH)?

Angelina_Jolie [31]

Number of moles:

1 mole ---------- 6.02x10²³ molecules
? moles --------- 9.45x10²⁴ molecules

1 x ( 9.45x10²⁴) / 6.02x10²³ =

9.45x10²⁴ / 6.02x10²³ => 15.69 moles of CH3OH

Therefore:

Molar mass CH3OH = 32.04 g/mol

1 mole ------------ 32.04 g
15.69 moles ----- mass methanol

Mass methanol = 15.69 x 32.04 / 1 => 502.7076 g

6 0

3 years ago

4.The anticipated productof this electrophilic aromatic substitution reaction is 4-bromoacetanilide.a)From analysis of your IR s

Lady_Fox [76]

Answer:

Part a: The IR spectrum is not sufficient due to the similar radical group presence in both product and reactants.

Part b: Mass Spectrum data is required in addition to the IR data for confirming the presence of recrystallized product.

Part c: The additional data is consistent with the expectations as the data is in support of that.

Explanation:

Part a

Acetanilide has a characteristic IR peak at around 3100-3200 cm^-1 (N-H Stretching) and 1500-1680 cm^-1 (C=O Stretching). Since a similar radical group ( $NHCOCH_3$ ) is present in the 4-bromoacetanilide, thus it is difficult to affirm the presence of the product solely on the basis of IR spectrum.