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natima [27]
3 years ago
6

What is true at stp? A)the temperature is 273.15 kelvin, B)one mole of gas occupies one liter of volume. C)pressure is at 101 vo

lume. D) volume is at 4.2 liters
Chemistry
1 answer:
fgiga [73]3 years ago
3 0
STP stands for standard temperature and pressure. Standard pressure is equivalent to 1 atm, and standard temperature is equivalent to 273.15 K. Therefore, your answer is A. the temperature is 273.15 kelvin.

Hope this helps!
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The concentration of oxalate ion (C2O42-) in a sample can be determined by titration with a solution of permanganate ion (MnO4-)
zmey [24]

Answer:

0.3152 M

Explanation:

The reaction that takes place is:

  • 2MnO₄⁻ + 5C₂O₄⁻² + 16H⁺ → 2Mn⁺² + 8H₂O + 10CO₂

First we <u>calculate the MnO₄⁻ moles used up in the titration</u>, <em>by multiplying the volume times the concentration</em>:

  • 21.93 mL * 0.1725 M = 3.783 mmol MnO₄⁻

Then we <u>convert MnO₄⁻ moles to C₂O₄⁻² moles</u>:

  • 3.783 mmoles MnO₄⁻ * \frac{5mmolC_2O_4}{2mmolMnO_4}= 9.457 mmol C₂O₄⁻²

Finally we <u>calculate the oxalate ion concentration</u>,<em> by dividing the moles by the volume</em>:

  • 9.457 mmol C₂O₄⁻² / 30.00 mL = 0.3152 M
6 0
2 years ago
A first-order reaction has a half-life of 20.0 minutes. Starting with 1.00 x 10^20 molecules
blsea [12.9K]

Answer:

E

Explanation:

100 minutes is   5 half lives  ( 100 min/20 min/half life)

         = (1/2 )^5

1 x 10^20    *    (1/2)^5 =   3.125 x10^18   molecules

7 0
1 year ago
Homogeneous mixture that does not settle out upon standing reflect light is an element. solid. hydrated.
andrey2020 [161]
Homogeneous mixture that does not settle out upon standing but which will reflect light is called COLLOIDS.
There are three types of homogeneous mixtures, these are: solutions, colloids and suspension. Colloids are usually distinguished by Tyndall effects. Light passing through a colloidal dispersion will be reflected.<span />
5 0
3 years ago
In a cooking context, which of the following materials is the best heat conductor?
Tasya [4]
I think iron because the other options are all bad conductors.
8 0
3 years ago
Naturally occurring zirconium exists are five isotopes. axe with a mass of 89.905 u(51.45%); Zr with a mass of 90.906 u (11.22%)
Anton [14]
Isotope 1: 89.905 * 51.45 = 4625.61225 / 100 = 46.2561225
Isotope 2: 90.906 * 11.22 = 1019.96532 / 100 = 10.1996532
Isotope 3: 91.905 * 17.15 = 1576.17175 / 100 = 15.7617075
Isotope 4: 93.906 * 17.38 = 1632.08628 / 100 = 16.3208628
Isotope 5: 95.908 * 2.08 = 268.5424 / 100 = 2.685424

46.2561225 + 10.1996532 +  15.7617075 + 16.3208628 + 2.685424 = 91.22377
actual mass Zr = about 91.22
8 0
3 years ago
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