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Reptile [31]
3 years ago
12

A team of geologists is surveying on a mountain. They come across a newly formed stream. The stream is flowing at an average rat

e of 420 cubic meters per minute. At the average rate of flow the stream will produce 14,700cubic meters of water in
Chemistry
1 answer:
zhannawk [14.2K]3 years ago
6 0

Answer:

35 minutes

Explanation:

The flow rate of the stream is the rate of volume of water with respect to time. It expresses the volume of water flowing per unit time.

Flow rate = \frac{volume}{time}

From the given question,

average flow rate of the stream = 420 cubic meters per minute, and the required volume = 14700 cubic meters.

So that;

time = \frac{volume}{flow rate}

       = \frac{14700}{420}

       = 35

time = 35 minutes

Therefore, with the given average flow rate, the steam will produce 14,700 cubic meters of water in 35 minutes.

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How many moles of H2O form when 4.5 moles O2 reacts?
mart [117]

Explanation:

Start with a balanced equation.

2H2 + O2 → 2H2O

Assuming that H2 is in excess, multiply the given moles H2O by the mole ratio between O2 and H2O in the balanced equation so that moles H2O cancel.

5 mol H2O × (1 mol O2/2 mol H2O) = 2.5 mol O2

Answer: 2.5 mol O2 are needed to make 5 mol H2O, assuming H2 is in excess.

4 0
3 years ago
What is the percent composition of each of the elements in Al(OH) 3 ?
stellarik [79]

Answer:

<em>Answer Below</em>

Explanation:

Percent composition by element

<u>Element </u>       <u>Symbol</u>  <u>Mass Percent</u>

Aluminium <u>Al</u>          34.590%

Hydrogen <u>H</u>          3.877%

Oxygen         <u>O</u>          61.533%

3 0
3 years ago
Read 2 more answers
Scientist can use the of minerals to tell them apart A.sound B.length C.size D.color
ipn [44]

Answer:

color

Explanation:

Scientists can use the color of minerals to tell them apart.

7 0
4 years ago
Which power source directs the electrons from oxidation-reduction reactions to flow through a device to give the device power? O
Lady bird [3.3K]

Answer:

B. A battery.

Explanation:

I just took the test

4 0
3 years ago
A certain substance X has a normal freezing point of -6.4 C and a molal freezing point depression constant Kf= 3.96 degrees C.kg
Brut [27]

Answer:  1.0\times 10^2g

Explanation:

Depression in freezing point is given by:

\Delta T_f=i\times K_f\times m

\Delta T_f=T_f^0-T_f=(-6.4-(13.6))^0C=7.2^0C = Depression in freezing point

i= vant hoff factor = 1 (for non electrolyte like urea)

K_f = freezing point constant = 3.96^0C/m

m= molality

\Delta T_f=i\times K_f\times \frac{\text{mass of solute}}{\text{molar mass of solute}}\times \text{weight of solvent in kg}}

Weight of solvent (X)= 950 g = 0.95 kg  

Molar mass of non electrolyte (urea) = 60.06 g/mol

Mass of non electrolyte (urea) added = ?

7.2=1\times 3.96\times \frac{xg}{60.06 g/mol\times 0.95kg}

x=1.0\times 10^2g

Thus 1.0\times 10^2g urea was dissolved.

8 0
4 years ago
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