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grandymaker [24]
3 years ago
15

Proportional means that

Chemistry
1 answer:
FromTheMoon [43]3 years ago
5 0
Corresponding in size or amount to something else.
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Question 4 Unsaved When writing electron configuration the 3d block comes after the 4s block. Question 4 options: True False
zmey [24]

Answer:

True

Explanation:

According to Aufbau's principle "sublevels with lower energies are filled up before those with higher energies".

Sublevels do not fill up in numerical order but there is a certain manner in which they are filled. The pattern is shown below:

  1s 2s 2p 3s 3p 4s 3d 4p 5s 4d 5p e.t.c

 We see that the 4s gets filled before the 3d sublevel.

6 0
3 years ago
For the following reaction, 4.64 grams of oxygen gas are mixed with excess benzene (C6H6). The reaction yields 3.95 grams of car
Reil [10]

Answer:

Theoretical yield for CO₂ is 5.10g

Explanation:

Reaction: 2C₆H₆(l) + 15O₂(g) → 12CO₂(g)  + 6H₂O(g)

We convert the mass of oxygen to moles:

4.64 g /32 g/mol = 0.145 moles of O₂

Let's find out the 100% yield reaction of CO₂ (theoretical yield)

Ratio is 15:12. So let's make this rule of three:

15 moles of O₂ can produce 12 moles of CO₂

Therefore 0.145 moles of oxygen will produce (0.145 . 12) /15 = 0.116 moles

We convert the moles to mass: 0.116 mol . 44 g / 1mol = 5.10 g

6 0
2 years ago
Read 2 more answers
Consider a buffer solution that is 0.50 M in NH3 and 0.20 M in NH4Cl. For ammonia, pKb=4.75. Calculate the pH of 1.0 L of the so
vladimir2022 [97]
You have 0.50 mol of NH3 and 0.20 mol of NH4+ to start (NH4Cl dissolves completely), given the molarity and 1.0 L solution.

30.0 mL of 1.0 M HCl is 0.0300 mol of HCl. This will react with the NH3 to produced 0.030 mol of NH4+.

You now have 0.47 mol NH3 and 0.23 mol NH4+. Now use the Henderson-Hasselbach equation to calculate your pH. The equation says to use concentration of acid and base, but you can just use the moles of them because it doesn’t make a difference.

pH = pKa + log(base/acid)

pKa = 14 - pKb = 14 - 4.75 = 9.25

pH = 9.25 + log(0.47/0.23) = 9.56
5 0
3 years ago
How many liters of carbon dioxide gas are in 18.6 moles of CO2 at STP?
PolarNik [594]

Answer:

416.876

Explanation:

Uhmm I am so so very sorry if this is incorrect

5 0
2 years ago
50mL of potassium hydroxide (KOH) solution contains 7 grams of potassium hydroxide.
Naddik [55]

Answer:

2.5 mol/L

Explanation:

We'll begin by calculating the number of mole in 7 g of KOH. This can be obtained as follow:

Mass of KOH = 7 g

Molar mass of KOH = 39 + 16 + 1

= 56 g/mol

Mole of KOH =?

Mole = mass /molar mass

Mole of KOH = 7 / 56

Mole of KOH = 0.125 mole

Next, we shall convert 50 mL to L. This can be obtained as follow:

1000 mL = 1 L

Therefore,

50 mL = 50 mL × 1 L / 1000 mL

50 mL = 0.05 L

Finally, we shall determine the molarity of the KOH solution. This can be obtained as follow:

Mole of KOH = 0.125 mole

Volume = 0.05 L

Molarity of KOH =?

Molarity = mole / Volume

Molarity of KOH = 0.125 / 0.05

Molarity of KOH = 2.5 mol/L

Thus, the molarity of the KOH solution is 2.5 mol/L

7 0
2 years ago
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