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3 years ago

A 250mL sample of air at STP contains approximately 52.5mL of O2. What is the percentage of oxygen in the air

Chemistry

1 answer:

RSB [31]3 years ago

4 0

Yessirrrrrrr wee litttttttt sirrrrr

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The reaction of an acid and a base will always produce what kind of salt?

Musya8 [376]

Explanation:

E maybe i am not sure or C

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3 years ago

Most of the elements in the periodic table are

Otrada [13]

Most of the elements in the periodic table are METALS........

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3 years ago

which statement correctly explains how magnesium and chlorine combine to form magnesium chloride? A) A Cl atom donates two elect

DiKsa [7]

Answer: D) An Mg atom donates one electron to each of the two Cl atoms.

Explanation: Ionic compound is formed by transfer of electrons from metal to non metal.

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.

Here magnesium is metal with atomic number 12 and chlorine is a non metal with atomic number of 17.

$Mg:12:1s^22s^22p^63s^2$

$Mg^{2+}:10:1s^22s^22p^6$

$Cl:17:1s^22s^22p^63s^23p^5$

$Cl^-:18:1s^22s^22p^63s^23p^6$

Thus magnesium loses two electrons to form $Mg^{2+}$ and chlorine atoms gain one electron each to form $Cl^-$

Thus the compound formed is $MgCl_2$ .

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3 years ago

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Certain minerals exclude lead but not uranium from their crystal structure, so when the minerals form they have no lead, only ur

likoan [24]

Answer:

The answer is " $1.4 \ \bold{ billion-years}$ ".

Explanation:

Using formula:

$\to N_{Now} = N_{orige}e^{\lambda t} \\\\$

$\to$ 1 U atom produces 1 Pb atom after decay.

$\to$ U's original numbers are now the sum of U counts and Pb counts.

$\to N_U=(N_U+N_{pb})e^{\lambda Ut}$

$\to 1 = (1+3) \ exp[(\frac{-\ln(2)}{t_{(half)}} \times t ]\\\\\to t = [\frac{\ln(4)}{\ln(2)}] \times t_{(half)}$

$= 14 \times 10^8 \ \ years\\\\=1.4 \ billion \ \ years$

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3 years ago

Find the value of <br> 17/15 •2/11

Anika [276]

Answer:

17/15 x 2/11 = 34/165

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3 years ago

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