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3 years ago

What element is 1s^2 2s^2 2p^6 3s2 3p^3

Chemistry

1 answer:

ruslelena [56]3 years ago

6 0

Answer:

Phosphorus

Explanation:

If you add up all the electrons (the exponents) it equals 15 which is the atomic number of phosphorus. And since stable atoms have the same number of protons and electrons it'll be phosphorus

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Write sentences that completely describe each of the chemical reactions shown in these skeleton equations. 11.1

Natasha2012 [34]

Please upload a photo of your question!

6 0

3 years ago

At 20 degrees Celsius the density of mercury is 13.6 g/cm cubed. What is the mass of 50.0 ml of mercury at 20 degrees Celsius?

Lynna [10]

Answer:

680g of mercury is the mass of the sample of mercury.

Explanation:

Density is an unit used to relates the mass of an object per unit of volume.

For example, in the problem, the density of mercury is 13.6g/cm³, as cm³ is equal to milliliters, mL, the density is: 13.6g/mL.

If you have 50.0mL of mercury, the mass is:

50.0mL * (13.6g / mL) =

<h3>680g of mercury is the mass of the sample of mercury.</h3>

4 0

3 years ago

At 1000°C, cyclobutane (C4H8) decomposes in a first-order reaction, with the very high rate constant of 79 1/s, to two molecules

leva [86]

Explanation:

It is known that for first order reaction, the equation is as follows.

t = $\frac{2.303}{K} log \frac{[C_{4}H_{8}]_{o}}{[C_{4}H_{8}]_{t}}$

t = ?, K = rate constant = 79 1/s

Initial conc. of $C_{4}H_{8}$ = 1.68

Decompose amount of $C_{4}H_{8}$ = 52% of 1.68

= $\frac{52}{100} \times 1.68$

= 0.8736

= 0.87

Now, $[C_{4}H_{8}]_{t}$ = (1.68 - 0.87)

= 0.81

Therefore, calculate the value of t as follows.

t = $\frac{2.303}{K} log \frac{[C_{4}H_{8}]_{o}}{[C_{4}H_{8}]_{t}}$

= $\frac{2.303}{79 s^{-1}} log \frac{1.68}{0.81}$

= $\frac{2.303}{79 s^{-1}} \times 0.316$

= $9.212 \times 10^{-3}$ s

= $0.00921 s$

Thus, we can conclude that 0.00921 s will be taken for 52% of the cyclobutane to decompose.

7 0

3 years ago

2 h<br> v=/<br> 3<br> m=500g<br> d = ?

Snowcat [4.5K]

More details? Can’t do anything wit that

3 0

3 years ago

What has more atoms, a mole of carbon or a mole of fluorine?

GuDViN [60]

Answer:

They have the same number of atoms

Explanation:

The mole (symbol: mol) is the base unit of amount of substance.

Think of mole meaning like inch. An inch of grass is the same as an inch of a flower. Mole is the standard measuring unit of atoms.

6 0

3 years ago