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3 years ago

7

ir masses that originate in the Gulf of Mexico A. continental tropical B. maritime tropical C. maritime polar D. continental pol

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1 answer:

qaws [65]3 years ago

3 0

The correct Answer is

Answer:B

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How many grams do 1.5 x 1026 atoms of magnesium weigh?

LUCKY_DIMON [66]

Answer:

0.3

Explanation:

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4 0

3 years ago

2 HI(g) ⇄ H2(g) + I2(g) Kc = 0.0156 at 400ºC 0.550 moles of HI are placed in a 2.00 L container and the system is allowed to rea

Alex_Xolod [135]

<u>Answer:</u> The concentration of hydrogen gas at equilibrium is 0.0275 M

<u>Explanation:</u>

Molarity is calculated by using the equation:

$\text{Molarity}=\frac{\text{Number of moles}}{\text{Volume of solution (in L)}}$

Moles of HI = 0.550 moles

Volume of container = 2.00 L

$\text{Initial concentration of HI}=\frac{0.550}{2}=0.275M$

For the given chemical equation:

$2HI(g)\rightleftharpoons H_2(g)+I_2(g)$

<u>Initial:</u> 0.275

<u>At eqllm:</u> 0.275-2x x x

The expression of $K_c$ for above equation follows:

$K_c=\frac{[H_2][I_2]}{[HI]^2}$

We are given:

$K_c=0.0156$

Putting values in above expression, we get:

$0.0156=\frac{x\times x}{(0.275-2x)^2}\\\\x=-0.0458,0.0275$

Neglecting the negative value of 'x' because concentration cannot be negative

So, equilibrium concentration of hydrogen gas = x = 0.0275 M

Hence, the concentration of hydrogen gas at equilibrium is 0.0275 M

4 0

3 years ago

What is the valence electron configuration for the oxygen atom

Lana71 [14]

Oxygen has six valence (outer-shell) electrons so therefore gains two more electrons to form the O-2 ion Its electron configuration is: 1s2 2s2 2p6 or Ne

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8 0

3 years ago

What gas is used in respiration

myrzilka [38]

Answer:

Los pulmones y el aparato respiratorio nos permiten respirar. Permiten la entrada de oxígeno en nuestros cuerpos (inspiración o inhalación) y expulsan el dióxido de carbono (expiración o exhalación). Este intercambio de oxígeno y dióxido de carbono recibe el nombre de "respiración"

La función del aparato respiratorio es mover dos gases: <em>el oxígeno y el dióxido de carbono</em>

Explanation:

6 0

3 years ago

Calculate δ h for the reaction:no (g) + o2 (g) ↔ no2 (g). given: 2o3(g) ↔ 3o2(g) δh=-426 kj o2(g) ↔ 2o(g) δh=+ 490 kj no(g) + o3

maks197457 [2]

To calculate the <span>δ h, we must balance first the reaction:

NO + 0.5O2 -----> NO2

Then we write all the reactions,

2O3 -----> 3O2   </span><span>δ h = -426 kj eq. (1)

O2 -----> 2O   </span><span>δ h = 490 kj eq. (2)

NO + O3 -----> NO2 + O2   </span><span>δ h = -200 kj eq. (3)

We divide eq. (1) by 2, we get

</span>O3 -----> 1.5O2   δ h = -213  kj eq. (4)

Then, we subtract eq. (3) by eq. (4)

NO + O3 -----> NO2 + O2 δ h = -200 kj
- (O3 -----> 1.5 O2 δ h = -213  kj)
NO -----> NO2 - 0.5O2 δ h = 13  kj eq. (5)

eq. (2) divided by -2. (Note: Dividing or multiplying by negative number reverses the reaction)

O -----> 0.5O2  <span>δ h = -245 kj eq. (6)
</span>
Add eq. (6) to eq. (5), we get

NO -----> NO2 - 0.5O2   δ h = 13  kj
+ O -----> 0.5O2 δ h = -245 kj
NO + O ----> NO2 δ h = -232 kj

<em>ANSWER:</em> <em>NO + O ----> NO2 δ h = -232 kj</em>

4 0

3 years ago