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Natalija [7]
3 years ago
11

an alloy contains 66 g of pure zinc. what is the percentage of zinc in the alloy? express your answer to two significant figures

and include the appropriate units.​
Chemistry
1 answer:
alekssr [168]3 years ago
6 0

Answer:

ba

Explanation:

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How many grams are in 32.2 L of CO2?
Naddika [18.5K]

Answer:

63.25 grams of CO₂

Explanation:

To convert from liters to grams, we first need to convert from liters to moles. To do this, we divide the liters by 22.4, the amount of liters of a gas per mole.

32.2 / 22.4

= 1.4375 moles of CO₂

Now we want to convert from moles to grams. To do this, we multiply the moles by the molar mass of CO₂. The total molar mass can be found on the periodic table by adding up the molar mass of carbon (12) and two oxygen (32).

12 + 32 = 44

Now we want to multiply the moles by the molar mass.

1.4375 • 44

= 63.25 grams of CO₂

This is your answer.

Hope this helps!

7 0
3 years ago
A 1,900-m3 water tower has been cleaned with a chlorine solution. The vapors of chlorine in the tower exceed allowable concentra
yaroslaw [1]

Answer:

t = 1862 s

Explanation:

To do this, we need first to determine the theorical detention time, which can be determined with the following expression:

t₀ = ∀/Q  (1)

Where:

t₀: detention time

∀: Volume of the fluid in the reactor

Q: Flow rate in the reactor

With this time, we must use the following expression to determine the time that the workers will take to vent the tank:

C = C₀ e^(-t/t₀)   (2)

From here, we must solve for time t, and the expression will be:

t = ln(C₀/C) * t₀   (3)

Now that we know the expression to use, let's solve for t. Using (1) to determine the detention time, ∀ is 1900 m³, and Q is 2.35 m³/s so:

t₀ = 1900 / 2.35 = 808.51 s

Now, let's solve for the time t. C will be 0.0015 mg/L (or 1.5 mg/m³ cause in 1 m³ we have 1000 L) and C₀ 15 mg/m³:

t = ln(15/1.5) * 808.51

<h2>t = 1861.66 s or simply 1862 s</h2><h2></h2>

Hope this helps

6 0
3 years ago
What happens when an ice cube melts in a glass of water?
morpeh [17]

Answer:

the water is warmer in temperature than the ice cube

Explanation:

the cube wouldn't melt if the water was colder or equally cold (eventually the water would equalize to the room temp) but for a while the water would have to be colder than the cube for the ice cube to stay in a solidified form

3 0
3 years ago
Who discovered the neutron? Bohr Chadwick Curie Schrodinger
Shtirlitz [24]
Chadwick did!

Hope this helps!
6 0
3 years ago
Read 2 more answers
Guys please help me...
valentina_108 [34]

Answer:

On the farm there are 70 chickens.

Explanation:

We can directly <u>work out the number of ducks from the given number of pigs</u>, with the <em>ratio of ducks to pigs</em>:

  • 36 pigs * \frac{5Ducks}{9Pigs} = 20 ducks

Then we<u> work out the number of chickens</u>, using the ration of chickens to ducks:

  • 20 ducks * \frac{7Chickens}{2Ducks} = 70 chickens

If on the farm there are 36 pigs, there are 70 chickens as well.

7 0
3 years ago
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