All categories

3 years ago

How many atoms are in 2.5 moles of Br?

1 answer:

6 0

The number of moles is 1000/18 = 55.556 moles. The number of molecules is therefore 6.022*1023 * 55.556 = 3.346*1025 molecules. The number of atoms is 3 times larger because each molecule has three atoms, so there are 1.0038*1026 atoms in a liter of water. Now we know enough to answer your question.

Hope this helps

You might be interested in

What chemical process occurs in cells to release energy?

Lana71 [14]

Answer:

B. Respiration

Explanation:

cellular respiration is the process where cells use glucose (C6H12O6) and oxygen gas (O2) to make carbon dioxide (CO2) water (H2O) and ATP, which is energy

formula:

C6H12O6 + 6O2 -> 6CO2 + 6H20 + 38ATP

3 0

3 years ago

1. How many grams are there in 7.5 x 1023 molecules of H2SO4?

Karo-lina-s [1.5K]

Answer:

I cannot give you all the answer but I can help you to solve those.

Explanation:

The first question:

How many grams are there in 7.5× $10^{23}$ molecules of $H_{2} SO_{4}$ ?

So we need to find the molecular mass first, use your periodic table,

And then we can find out 2+32+16×4=98 g/mol

Then, we need to find how many moles, by using Avogadro's constant:

Avogadro's constant: 1 mole = 6.02× $10^{23}$

∴ $\frac{7.5*10^{23} }{6.02*10^{23}}$ =1.25 mol(2d.p.)

Lastly, find the grams using the formula $M= \frac{m}{n}$

m=Mn

m=1.25*98

m=122.5g

-------------------------------------------------------------------------------------------------------------

In conclusion, use those formula to help you:

$M= \frac{m}{n}$ (which M = molecular mass(atomic mass) m=mass of the substance and n = moles)

Avogadro's constant: $\frac {molecular mass} {6.02*10^{23}} = moles$

5 0

3 years ago

Which of the following reactant pairs will not react together to produce a reaction?

Art [367]

I think the correct answer from the choices listed above is option D. the substances cobalt and barium chloride will not react since cobalt os less active than barium so it does not have enough energy to displace barium in the compound. Hope this answers the question.

5 0

4 years ago

Magtala ng limang (5) pamamaraan kung paano huhubugin ang konsiyensiya ng tao upang kumiling ito sa mabuti at hindi sa masama

Sergeu [11.5K]

Answer:

Siguraduhin na ang mga pagpapasya mo ay may tamang gabay.
Iwasan ang manghusga sa kapwa.
Huwag gumawa ng masama sa sarili, sa kapwa o kahit kanino pa
Huwag pakinggan ang mga sinasabi nila na nakakapagpababa sayo, dapat ay ipagpatuloy lang ang nais na gawin ng iyong sarili hangga't alam mo sa sarili mo na tama ang iyong ginagawa
Huwag gayahin ang mga maling nakikita sa paligid

3 0

3 years ago

Why are koalas so crusty?

marishachu [46]

Koalas are not crusty, but their fur is very coarse, like wool.
Hope this helps.

6 0

4 years ago

Read 2 more answers