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2 years ago

A reaction produces 0.863 moles of H2O. How many molecules are produced?

Chemistry

2 answers:

Stolb23 [73]2 years ago

8 0

Number of molecules = moles x 6.02 x 10^23 = 0.863 x 6.02 x 10^23
= 5.19 x 10^23 molecules.

balu736 [363]2 years ago

4 0

To convert from moles to molecules, you multiply by Avogadro's constant.

0.863 moles H₂O * (6.022*10^23 molecules/1 mole) = 5.20*10^23 molecules H₂O

5.20*10^23 molecules of H₂O are produced.

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In a coffee shop, the following coffee samples are prepared for customers. i. 10 g of sugar added to 100 g of coffee ii. 10 g of

dem82 [27]

So solve this we must know the amount of sugar per gram of coffee

i. 10 g sugar /100 g coffee = 0.1 g sugar/ 1 g coffee

ii. 10 g sugar / 200 g coffee = 0.05 g sugar / 1 g coffee

iii. 4 g sugar / 200 g coffee = 0.02 g sugar / 1 g coffee

iv. 4 g sugar / 100 g coffee = 0.04 g sugar / 1 g coffee

So the ranking from sweetest so the least is:

i, ii, iv, iii

4 0

2 years ago

Read 2 more answers

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stellarik [79]

Explanation:

150 grams is .15 liters

1 mole of gas at STP occupies 22.414 liters

.15 liter of hydrogen represents .15/22.414 =

0.0066922 moles of H2

equation is

Zn + 2HCl → ZnCl2 + H2

1 mole of Zn will make 1 mole of H2

0.0066922 moles of Zn will make 0.0066922 moles of H2

To convert this molar quantity of zinc into grams we simply multiply by the atomic mass of zinc, which is

65.38 g/mol;-

Mass of Zn required = 0.0066922 moles * 65.38 g/mol = 0.4375390381 grams

https://www.quora.com/How-many-grams-of-Zinc-would-you-need-to-react-with-Hydrochloric-acid-to-produce-1-L-of-H2-gas

7 0

1 year ago

Which of the following metals has the main part of the garden fork been made from? a. aluminum b. iron c. copper d. zine

xxTIMURxx [149]

Answer:

Its letter A

Explanation:

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8 0

2 years ago

A sample of solid NH 4HS is placed in a closed vessel and allowed to equilibrate. Calculate the equilibrium partial pressure (at

UNO [17]

Answer:

The answer to the question is

The equilibrium partial pressure (atm) of ammonia, assuming that some solid NH₄HS remains 0.26 atm.

Explanation:

To solve the question, we write out the chemical equation as follows

NH₄HS (s) ⇄ NH₃ (g) + H₂S (g)

From the above equation, it is observed that only the gaseous products contribute to the partial pressure

Kp =PNH₃·PH₂S where at Kp = 0.070 and PNH₃, PH₂S are the partial pressures of the gases

However since the number of moles of both gases are equal, therefore by Avogadro's law PNH₃ = PH₂S

Then PNH₃ = √(0.07) = PH₂S = 0.2645 atm. ≅ 0.26 atm.

5 0

2 years ago

Determine the frequency of radiation whose wavelength is 7.67 x 10^-7 cm. Then, determine the amount of energy in the radiation.

dimulka [17.4K]

Answer:

They frequency = 3.9 * 10^16 Hz

The amount of energy E = 2.58 *10^-17 J

Explanation:

Step 1: Data given

wavelength is 7.67 * 10^-7 cm

Step 2: Calculate the frequency

f = c / λ

⇒ with λ = the wavelength in nm = 7.67 nm

⇒ with c = the speed of light = 3.00 * 10^8 m/s

⇒ f = the frequency = TO BE DETERMINED

f = (3.00 * 10^8 m/s) / 7.67 * 10^-9 m

f = 3.9 * 10 ^16 /s = 3.9 * 10^16 Hz

They frequency is 3.9 * 10^16 Hz

Step 3: Calculate the amount of energy

E = h *f

⇒ with E = the amount of energy (in joule)

⇒ h = Planck's constant = 6.626 *10^-34 J*s

⇒ with f = the frequency

E = 6.626 *10^-34 J*s * 3.9 * 10^16 Hz

E = 2.58 *10^-17 J

8 0

2 years ago