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nadya68 [22]
3 years ago
6

Help with this question

Chemistry
2 answers:
luda_lava [24]3 years ago
6 0

<span>so you know that   </span><span>Oxygen. A, number of protons and neutrons=16 and Z, number of protons=8</span>

<span />so...you find the amount of neutrons a-z=n

16-8=n

16-8=8

<span>then for oxygen A number of protons and neutrons,=18,Z,number of neutrons=8</span>

<span>so....18-8=N</span>

<span>18-8=10</span>

<span>so the difference is in the number of there neutrons, and the main reason of them being a isotope.
</span>

NeTakaya3 years ago
3 0
Isotope atoms mean, atoms with the same number of protons but different number of neutrons in their nuclei . The given oxygen atoms are isotopes meaning they have different number of neutrons in their nuclei . Oxygen 16 have 8 protons and 8 neutrons in its nucleus but Oxygen has 8 protons and 10 neutrons. That's what make them different.

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First, we have to get:

1- The heat required to increase T of ice from -50 to 0 °C:

according to q formula:

q1 = m*C*ΔT

when m is the mass of ice = mol * molar mass

                                             =  1 mol * 18 mol/g

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and C is the specific heat capacity of ice = 2.09 J/g-K

and ΔT change in temperature = 0- (-50) = 50°C

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∴q1 = 18 g * 2.09 J/g-K *50°C

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2- the heat required to melt this mass of ice is :

q2 = n*ΔHfus 

when n is the number of moles of ice = 1 mol

and ΔHfus = 6.01 KJ/mol

by substitution:

q2 = 1 mol * 6.01 KJ/mol

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3- the heat required to increase the water temperature from 0°C to 60 °C is:

q3 = m*C*ΔT

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5 0
3 years ago
The sea water has 8.0x10^-1 cg of element strontium. Assuming that all strontium could be recovered, how many grams of strontium
PilotLPTM [1.2K]

984 grams of strontium will be recovered from 9.84x10^8 cubic meter of seawater.

Explanation:

From the question data given is :

volume of strontium in sea water= 9.84x10^8 cubic meter

(1 cubic metre = 1000000 ml)

so 9 .84x10^8 cubic meter

 \frac{9 .84x10^8}{1000000}      = 984 ml.

density of sea water = 1 gram/ml

from the formula mass of strontium can be calculated.

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mass = density x volume

mass = 1 x 984

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98400 centigram of strontium will be recovered.

Strontium is an alkaline earth metal and is highly reactive.

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