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3 years ago

How many atoms in 2.25 mol of O2

Chemistry

1 answer:

Luden [163]3 years ago

3 0

Answer:

1 molecule of oxygen has 2 atoms.

So 2,25 molecules of oxygen have 2 x 2,25 atoms.

2 x 2,25 = 4,5 atoms

There are 4,5 atoms in 2,25 molecules oxygen.

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What is the mass of 2.70 ×10^22 molecules of NaOH (Molar mass = 40.0 g/mol)?

Viefleur [7K]

Data:
Molar Mass of NaOH = 40 g/mol

Solving: According to the Law Avogradro, we have in 1 mole of a substance, 6.02x10²³ atoms/mol or molecules

1 mol -------------------- 6.02*10²³ molecules
y mol -------------------- 2.70*10²² molecules

6.02*10²³y = 0.270*10²³
$y = \frac{0.270*\diagup\!\!\!\!\!\!10^{\diagup\!\!\!\!\!\!23}}{6.02*\diagup\!\!\!\!\!\!10^{\diagup\!\!\!\!\!\!23}}$
$\boxed{y \approx 0.04\:mol}$

Solving: Find the mass value now

40 g ----------------- 1 mol of NaOH
x g ------------- 0.04 mol of NaOH

$x = 40*0.04$
$\boxed{\boxed{x = 1.6\:g}}\end{array}}\qquad\quad\checkmark$

Answer:
The mass is 1.6 grams

6 0

3 years ago

This type of nucleus is formed during a solar nuclear reaction by the fusion of four nuclei.

katovenus [111]

a helium-4 nucleus is formed

5 0

4 years ago

Nother metal phosphate is iron phosphate. it will behave similar to calcium phosphate in an acid solution. what is the net ionic

Serhud [2]

Iron phosphate when in acidic solution would dissociate into ions namely the iron ions and the phosphate ions. Furthermore, the phosphate ion would react to the hydronium ions forming HPO4^2-. To determine the net ionic equation we do as follows:

FePO4 <---------> Fe3+ + (PO4)3-
(PO4)3- + H3O+ <--------------> HPO4^2- + H2O

Adding the two equations would yield to:

FePO4(s) + H3O+(aq) ⇌ Fe^3+(aq) + HPO4^2−(aq) + H2O(l)

3 0

3 years ago

How many molecules are in 165 grams g of carbon dioxide ?

KATRIN_1 [288]

Answer:

There are 2.258 x 10^24 molecules of CO2 in 165 grams of CO2.

Explanation:

First you have to calculate the molar mass of carbon dioxide ⇒ 44 grs/mol. Then,

44 grs ------------- 1 mol CO2

165 grs ------------ x = 3.75 moles of CO2.

Then, from Avogadros constant we have that there are 6.022 x 10^23 molecules in 1 mol. So,

1 mol CO2 ---------------- 6.022 x 10^23 molecules CO2

3.75 moles CO2-------- x = 2.258 x 10^24 molecules CO2.

There are 2.258 x 10^24 molecules CO2 in 165 grams of CO2.

3 0

3 years ago

How many moles of H3PO4 are there in 658 grams of H3PO4?

solmaris [256]

97.995181 would be the correct answer

8 0

3 years ago

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