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3 years ago

How does magnesium and nitric acid react? (Observations)

1 answer:

5 0

It depends on the strength of the nitric acid. With dilute acid magnesium nitrate and hydrogen gas is formed. The gas reacts violently with a naked flame.

With concentrated nitric acid a violent reaction occurs and lots of reddish brown fumes of nitrogen oxides (NO and NO2) are produced.

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Carbonic anhydrase of erythrocytes (Mr 30,000) has one of the highest turnover numbers known. It catalyzes the reversible hydrat

Afina-wow [57]

Explanation:

According to the given data, the turnover number can be calculated as follows.

Turnover number = $K_{cat} = \frac{V_{max}}{\text{Concentration of enzyme}}$

$V_{max} = \frac{\text{Moles of CO_{2} hydrolyzed}{second}$

Therefore, moles of $CO_{2}$ hydrolyzed is as follows.

Moles of $CO_{2}$ hydrolyzed = $\frac{Mass of CO_{2}}{Molar mass of CO_{2}}$

= $\frac{0.30}{44}$

= 0.00682 moles

Now, moles of $CO_{2}$ hydolyzed per second is calculated as follows.

Moles of $CO_{2}$ hydolyzed per second = $\frac{0.00682}{60}$

= $1.137 \times 10^{-4} moles/second = V_{max}$

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Moles of enzyme = $\frac{Mass}{\text{Molar mass}}$

= $\frac{10.0 \mu g}{30000}$

= $3.33 \times 10^{-10}$ moles

Therefore, the value of $K_{cat}$ is as follows.

$K_{cat} = \frac{1.137 \times 10^{-4} moles}{3.333 \times 10^{-10} moles}$

= $0.3411 \times 10^{6}$ per second

= $0.3411 \times 60 \times 10^{6}$ per minute

= $20.466 \times 10^{6}$ per minute

Thus, we can conclude that the turnover number ( $K_{cat}$ ) of carbonic anhydrase (in units of $min^{-1}$ ) is $20.466 \times 10^{6}$ per minute.

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3 years ago

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egoroff_w [7]

Explanation:

$explanation : - \\ \\ volume \: of \: 1 \: mole \: of \: a \: gas \: \\ \\ at \: stp \: is \: 22.4 \: litre \\ \\ so \: \: \: number \: of \: moles \: of \: oxygen \: \\ \\ = 1 \: moles \: \\ \\ hence \: the \: mass \: of \: one \: mole \: \\ = 1 \: mole \: \\ \\ mass \: of \: 1 \: mole \: of \: oxygen \: \\ \\ = > 15.99 \: grams \: \: \: (answer) \\ \\ hope \: it \: helps \: \: \: (. ❛ ᴗ ❛.)$

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3 years ago

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