What is the standard reduction potential, E, for the half-reaction Al(aq) +

In which compound is the percent by mass of oxygen greatest?

Licemer1 [7]

Answer: BeO

Explanation:

percent by mass of oxygen $=\frac{\text {mass of oxygen}}{\text {Total mass of substance}}\times 100\%$

percent by mass of oxygen in BeO $=\frac{16g}{25.01g/mol}\times 100=63.97\%$

percent by mass of oxygen in MgO $=\frac{16g}{40.30g/mol}\times 100=39.70\%$

percent by mass of oxygen in CaO $=\frac{16g}{56.08g/mol}\times 100=28.53\%$

percent by mass of oxygen in SrO $=\frac{16g}{103.62g/mol}\times 100=15.44\%$

4 0

3 years ago

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Which of the following does NOT show the law of conservation of mass?

algol [13]

I think the correct answer from the choices listed above is option B. <span>24 mL of Mg burn in 32 mL O2 to produce 56 mL of MgO </span>does not show the law of conservation of mass. Volumes cannot be added because there are volume effects when you add different substances. So, the reactants is not equal to the product.

4 0

4 years ago

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A drop of gasoline has a mass of 22 mg and a density of 0.754 g/cm3. What is its volume in cubic centimeters?

ArbitrLikvidat [17]

1.22 mg is the same as .022 grams. One gram equals 1000 mg. Convert mg to grams by dividing mg by 1000mg/gm. Volume = mass over density. Volume equals .022 grams over .754 grams/cm3 which equals .029 or .03cm3. 2.weight in kg times gravity constant. Weight in newtons equals 10kg times 9.8m/s2 that equals 98 newtons.

5 0

3 years ago

Ammonium nitrate, a common fertilizer, is used as an explosive in fireworks and by terrorists. It was the material used in the t

Sladkaya [172]

Explanation:

The given balanced reaction is as follows.

$2NH_{4}NO_{3} \rightarrow 2N_{2} + O_{2} + 4H_{2}O$