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4 years ago

What factor affects the luminosity of a star?

Chemistry

1 answer:

marshall27 [118]4 years ago

3 0

The size and the temperature affects the luminosity of a star

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¿Por qué los hongos no producen su propio alimento?

Vlada [557]

Answer:

Los hongos, a diferencia de las plantas que utilizan la fotosíntesis para producir su alimento, absorben los nutrientes de materia orgánica que descomponen.

Explanation:

8 0

3 years ago

The equilibrium constant, Kc, for the reaction N2O4(g)⇌2NO2(g) is 5.0×10−3. If the equilibrium mixture contains [NO2] = 0.050 M

Sergeu [11.5K]

Answer:

0.50 M is the molar concentration of $N_2O_4$ .

Explanation:

The equilibrium constant of the reaction = $K_c=5.0\times 10^{-3}$

$N_2O_4(g)\rightleftharpoons 2NO_2(g)$

Equilibrium concentration of $NO_2$ = 0.050 M

$[NO_2]=0.050 M$

Equilibrium concentration of $N_2O_4$ = ?

$[N_2O_4]= x$

The equilibrium constant of the reaction is given aSL:

$K_c=\frac{[NO_2]^2}{[N_2O_4]}$

$K_c=\frac{(0.050 M)^2}{x}=5.0\times 10^{-3}$

$x = 0.50 M$

0.50 M is the molar concentration of $N_2O_4$ .

4 0

4 years ago

If 30cm³ of 0.45 mol dm3 HCl reacted with NaOH, how many moles of HCl reacted?

77julia77 [94]

Moles HCl reacted : 0.0135

<h3>Further explanation</h3>

Molarity shows the number of moles of solute in every 1 liter of solute or mmol in each ml of solution

$\large {\boxed {\bold {M ~ = ~ \dfrac {n} {V}}}$

Where

M = Molarity

n = Number of moles of solute

V = Volume of solution

So to find the number of moles can be expressed as

n = V x M

The volume of HCl 30 cm³=3.10⁻² dm³

Molarity of HCl = 0.45 mol/dm³

so moles HCl reacted :

$\tt n=3.10^{-2}\times 0.45=0.0135$

3 0

3 years ago

What stage in the rock cycle is between metamorphic rock and igneous rock

mr Goodwill [35]

Answer:

sedimentary rock

Explanation:

Because there are three stages, first igneous rock changes into either sedimentary rock or meatamorphic rock.

4 0

3 years ago

Which of the following is not an intensive physical property of matter?

Step2247 [10]

Answer:

Concentration

Explanation:

Amount of substance concentration often called simply concentration, is a quantitative measure of the number of atom s per unit volume in a sample of a matter.

5 0

3 years ago