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rodikova [14]
3 years ago
7

NEED HELP ON 15,and 16. PLEASE. Only if you are positive.

Chemistry
1 answer:
Alborosie3 years ago
5 0

Answer:

15. A

16. B

I hope it helps you

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How many elements are there?
svlad2 [7]

Answer:

118 is your answer!

5 0
3 years ago
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Two liters of a perfect gas are at 0>c and 1 atm. if the gas is nitrogen, n2, determine the number of molecules.
ZanzabumX [31]

Solution;

The gas is at STP;

Where; T = 273 K , P = 1 atm

We know that 1 mole of a gas at STP occupies a volume of 22.4 liters .

V1/n1 = V2/n2

n2 = (V2/V1) n1

n2 = (2 l/22.4 l)(1 mole)

n2 = 0.0893 moles

But 1 mole of a compound has 6.022 × 10^23 molecules

Thus, number of molecules = 0.0893 moles × 6.022 ×10^23 molecules

= 5.378 × 10^22 molecules.

4 0
4 years ago
Suggest why sodium and hydrogen ions do not diffuse at the same rate
Troyanec [42]

Answer:

sodium has got ionic bonds that are weak

compared to hydrogen covalent bonds that are strong

8 0
3 years ago
4. An 82 kg hiker climbs Mt. Humphrey near Flagstaff. During a two hour period, the hiker's
bazaltina [42]

Answer:

\Delta E = 434253.96\,J, \Delta P = 60.313\,W

Explanation:

The change in energy is given by the change in gravitational potential energy:

\Delta E = m\cdot g \cdot \Delta h

\Delta E = (82\,kg)\cdot (9.807\,\frac{m}{s^{2}} )\cdot (540\,m)

\Delta E = 434253.96\,J

The average rate of change in terms of time is approximately this:

\Delta P = \frac{\Delta E}{\Delta t}

\Delta P = \frac{434253.96\,J}{(2\,h)\cdot (\frac{3600\,s}{1\,h} )}

\Delta P = 60.313\,W

8 0
3 years ago
Which type of reaction occurs when 50mL quantities of 1 M Ba(OH)2 (aq) and H2SO4 (aq) are combined
iragen [17]
Double replacement.

Ba(OH)2 + H2SO4 ====> 2H2O + BaSO4
5 0
4 years ago
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