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3 years ago

Please help serious answers only

Chemistry

1 answer:

Darya [45]3 years ago

3 0

Answer:

Neptune and Saturn although Neptune isn't on there so just Saturn.

hope it'll help ya out!

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When we reverse a chemical equation,we multiply it's delta H value by

Illusion [34]

Delta H is negated. Multiply by -1

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4 years ago

Which of the following best describes a scientific model?

3241004551 [841]

Explanation:

idea= hypothesis

xperience in nature= read Darwin's theory..

with birds from Galapagos island or rain forest environment., had proven that the shape of a bird's beaks, determined what their diet consisted of In the wild.

captured birds from such countries, has proven, an omnivore or seed eater...through testing plus dissection.

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3 years ago

Liquid A is poured into Liquid B and a single, clear layer results. More Liquid A is added and two distinct layers form. The sol

pogonyaev

Answer:

Explanation:

Liquid A is poured into Liquid B and a single, clear layer results. More Liquid A is added and two distinct layers form. The solution is now unsaturated and there is a static equilibria occurring

4 0

3 years ago

A gas used to extinguish fires is composed of 75 % CO2 and 25 % N2. It is stored in a 5 m3 tank at 300 kPa and 25 °C. What is th

tatyana61 [14]

Answer : The partial pressure of the $CO_2$ in the tank in psia is, 32.6 psia.

Explanation :

As we are given 75 % $CO_2$ and 25 % $N_2$ in terms of volume.

First we have to calculate the moles of $CO_2$ and $N_2$ .

$\text{Moles of }CO_2=\frac{\text{Volume of }CO_2}{\text{Volume at STP}}=\frac{75}{22.4}=3.35mole$

$\text{Moles of }N_2=\frac{\text{Volume of }N_2}{\text{Volume at STP}}=\frac{25}{22.4}=1.12mole$

Now we have to calculate the mole fraction of $CO_2$ .

$\text{Mole fraction of }CO_2=\frac{\text{Moles of }CO_2}{\text{Moles of }CO_2+\text{Moles of }N_2}$

$\text{Mole fraction of }CO_2=\frac{3.35}{3.35+1.12}=0.75$

Now we have to calculate the partial pressure of the $CO_2$ gas.

$\text{Partial pressure of }CO_2=\text{Mole fraction of }CO_2\times \text{Total pressure of gas}$

$\text{Partial pressure of }CO_2=0.75mole\times 300Kpa=225Kpa=225Kpa\times \frac{0.145\text{ psia}}{1Kpa}=32.625\text{ psia}$

conversion used : (1 Kpa = 0.145 psia)

Therefore, the partial pressure of the $CO_2$ in the tank in psia is, 32.6 psia.

3 0

3 years ago

Calculate the molarity of a solution containing 0.2 mol nh4br in exactly 200 ml solution

Tems11 [23]

Molarity is calculated using the following equation:
number of moles solute/ number of litres of solvent.
Number of moles = 0.2 moles (given)
1 litre = 1000 ml
Therefore, 200 ml = 0.2 litres
Using the previously mentioned equation, we can calculate molarity as follows:
Molarity = 0.2/0.2 = 1

8 0

4 years ago