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4 years ago

What is the mass of 6.75 moles of CO₂?

1 answer:

8 0

Hi there!
Thank you for choosing Brainly.

1 mole = 44.0095

So take that number and multiply it by 6.75.

You then get... 297.0641

Have a nice day.
~Brooke

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How many ions of aluminum oxide (Al²O³) are there in 200 g of Al²O³??

valentinak56 [21]

= 6.022 × 1020

Explanation;

Mole of aluminium oxide (Al2O3) is

⇒ 2 x 27 + 3 x 16

Mole of aluminium oxide = 102 g

i.e., 102 g of Al2O3= 6.022 x 1023 molecules of Al2O3

Then, 0.051 g of Al2O3 contains = 6.022 x 1023 / (102 x 0.051 molecules)

= 3.011 x 1020 molecules of Al2O3

The number of aluminium ions (Al3+) present in one molecule of aluminium oxide is 2.

Therefore, the number of aluminium ions (Al3+) present in 3.11 × 1020 molecules (0.051g) of aluminium oxide (Al2O3)

= 2 × 3.011 × 1020

= 6.022 × 1020

hope it helps_

6 0

2 years ago

Please help! you’ll be marked brainliest

Trava [24]

Answer:

Number of Protons:

Co: 27

Cl: 17

K: 19

S: 16

Al: 13

P: 15

Number of Electrons:

Co: 25

Cl: 18

K: 18

S: 18

Al: 10

P: 18

4 0

3 years ago

Why is Azulene aromatic ?

evablogger [386]

Add 2 that’s why and I said if

3 0

3 years ago

A solution of 0.170 mol/l ion strength is prepared using NaNO3 (solid) and Na2SO4 (solid). Calculate the mass of each salt that

just olya [345]

Answer:

1,06 g of NaNO₃ and 1,42 g of Na₂SO₄

Explanation:

In water, NaNO₃ and Na₂SO₄ dissociates as:

NaNO₃ → Na⁺ + NO₃⁻

Na₂SO₄ → 2 Na⁺ SO₄²⁻

The ionic strength is difined as:

∑ $\frac{C_{i} Z_{i}^2}{2}$ Where Ci and Zi are concentration and charge of each ion in solution. Thus:

$\frac{C_{Na+}+C_{NO3-}+4C_{SO4-}}{2}$ = 0,170 mol/L

Knowing $C_{Na^+}$ = 0,130 mol/L you can obtain:

0,210 mol/L = $C_{NO_{3}^-}+4C_{SO_{4}^{2-}}$ (1)

The 0,130 mol/L of Na⁺ comes from $C_{NaNO_{3}}+2C_{Na_{2}SO_{4}}$ , thus:

0,130 mol/L = $C_{NO_{3}^-}+2C_{SO_{4}^{2-}}$ (2)

Replacing (2) in (1)

$C_{NO_{3}^-} = 0,050 M$

And:

$C_{SO_{4}^{2-}} = 0,040 M$

The 0,050 M of NO₃⁻ comes from:

0,050M×0,250L× $\frac{84,99 g}{1molNaNO_{3}}$ = 1,06 g of NaNO₃

The 0,040 M of SO₄⁻ comes from:

0,040M×0,250L× $\frac{142,04 g}{1molNa_{2}SO_{4}}$ = 1,42 g of Na₂SO₄

I hope it helps!

5 0

3 years ago

Tigers and crocodiles are more closely related than tigers and sharks. Which statement about shared characteristics best support

Luda [366]

Answer: Crocodiles and tigers both have four legs

Explanation: Even when sharks and tigers are both meat eaters, the question is about similarities between tigers and crocodiles, so D is out. A is about crocodiles and sharks, so it's out also. B suits for sharks too, so it's out too. C is the most suitable answer, because both animals have four legs, which means that they belong to the group of quadrupede animals.

5 0

3 years ago

Read 2 more answers