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3 years ago

5

Hydrogen fuel cells burn with _ and produce _.

2 answers:

guapka [62]3 years ago

6 0

Hydrogen fuel cells burn with Oxygen and produces Water.

It is commonly used to produce electricity.

AveGali [126]3 years ago

5 0

Answer:

with oxygen to form water

Explanation:

In a flame of pure hydrogen gas, burning in air, the hydrogen (H2) reacts with oxygen (O2) to form water (H2O) and releases heat. If carried out in atmospheric air instead of pure oxygen (as is usually the case), hydrogen combustion may yield small amounts of nitrogen oxides, along with the water vapor.

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A chemist must prepare 300.0mL of nitric acid solution with a pH of 0.70 at 25°C. He will do this in three steps: Fill a 300.0mL

d1i1m1o1n [39]

<u>Answer:</u> The volume of concentrated solution required is 9.95 mL

<u>Explanation:</u>

To calculate the pH of the solution, we use the equation:

$pH=-\log[H^+]$

We are given:

pH = 0.70

Putting values in above equation, we get:

$0.70=-\log[H^+]$

$[H^+]=10^{-0.70}=0.199M$

1 mole of nitric acid produces 1 mole of hydrogen ions and 1 mole of nitrate ions.

Molarity of nitric acid = 0.199 M

To calculate the volume of the concentrated solution, we use the equation:

$M_1V_1=M_2V_2$

where,

$M_1\text{ and }V_1$ are the molarity and volume of the concentrated nitric acid solution

$M_2\text{ and }V_2$ are the molarity and volume of diluted nitric acid solution

We are given:

$M_1=7.0M\\V_1=?mL\\M_2=0.199M\\V_2=350mL$

Putting values in above equation, we get:

$7.0\times V_1=0.199\times 350.0\\\\V_1=\frac{0.199\times 350}{7.0}=9.95mL$

Hence, the volume of concentrated solution required is 9.95 mL

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2 years ago

Which of the following is the most accurate description of all known spaces

vazorg [7]

Answer:

where are the following??

like anything? any animal?

Explanation:

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3 years ago

What parts are present in every chemical equation?

77julia77 [94]

I believe it’s

The reactants

The products

And the Arrow indicating the direction of the chemical reaction

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Leto [7]

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Anni [7]

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3 years ago

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