Answer:
HCl(aq) + KOH(aq) ===> H2O(l) + KCl(aq)
Note the stoichiometry of the balanced equations shows us that HCl and KOH react in a 1:1 mole ratio. So, let us find moles of HCl and moles of KOH that are present:
moles HCl = 250.0 ml x 1 L/1000 ml x 0.25 mol/L = 0.06250 moles HCl
moles KOH = 200.0 ml x 1 L/1000 ml x 0.40 mol/L = 0.0800 moles KOH
You can see that there are more moles of KOH than there are of HCl, meaning that KOH is in excess and after neutralizing all of the HCl, the solution will be left with excess KOH making the pH > 7 = BASIC
The theoretical heat of fusion of ice is 6,01 kmoland the molar - mass of ice is 18.02 g/mol. The thermal energy needed to melt 180 g of ice at 0.00°is
Answer:
60.01 kJ energy to melt 180g of ice, assuming my figure for heat of fusion.
Explanation:
Please check the wording of the question. "6,01 kmoland the molar - mass of ice is 18.02 g/mol" is hard to interpret.
I'll assume the heat of fusion of ice is 6.01 kJ/mole?
180 grams of solid water (ice) is 180g/(18.02 g/mole) or 9.999 moles, rounded to 3 sig figs to 10 moles.
(10 moles H2O)*(6.01 kJ/mole) = 60.01 kJ energy to melt 180g of ice.
PLEASE HELP!
Perform the following operation
and express the answer in
scientific notation.
5.450x10-4 x 3.550x 10-7
[ ? ]x10[?]
Answer:
[tex]5.450 \times {10}^{ - 4 } \times 3.550 \times {10}^{ - 7} \\ 19.3475 \times {10 }^{ - 11} \\ 1.935 \times {10}^{?10} [/tex]
I need the answer to this
Answer:
advisory
Explanation:
advisory is issued in order to help those who are unaware
1. How many molecules of C₁₂H₂₂O₁₁ are in 179g of C₁₂H₂₂O₁₁?
[tex] \qquad \quad \large {\pmb{ \frak { \mid {\overline{ \underline{\purple{ \bigstar \: Required \: Answer \: \bigstar}}}}}} \mid}\\[/tex]
We are given –
Mass of C₁₂H₂₂O₁₁ is 179g. So, let's find molar mass and moles number of C₁₂H₂₂O₁₁.[tex]\qquad[/tex][tex] \pink{\bf\longrightarrow { Molar \:mass \:of \:C₁₂H₂₂O₁₁ :-} }[/tex]
[tex]\qquad[/tex][tex] \bf \twoheadrightarrow 12\times 12+1\times 22+16\times 11 [/tex]
[tex]\qquad[/tex][tex] \bf \twoheadrightarrow 342[/tex]
[tex]\qquad[/tex]____________________
Calculating the number of moles present in 179 g of C₁₂H₂₂O₁₁.
[tex]\qquad[/tex][tex] \purple{\sf\longrightarrow { No \:of \:moles = \dfrac{Given \:mass}{Molar\: mass}}}[/tex]
[tex]\qquad[/tex][tex] \bf \twoheadrightarrow \dfrac{179}{342}[/tex]
[tex]\qquad[/tex][tex] \bf \twoheadrightarrow \cancel{\dfrac{179}{342}}[/tex]
[tex]\qquad[/tex][tex]\purple{ \bf \twoheadrightarrow 0.523\: moles}[/tex]
Avogadro number = 6.022×10²³☀️No.Of Molecules –
=Moles × Avogadro number
= 0.523 × ( 6.02×10²³)
= 3.15 × 10²³
_________________________________
7.
_______is the ability to move an object some distance.
Answer:
Energy
Explanation:
energy is defined in science as the ability to move matter or change matter in some other way energy can also be Eefined as the ability to do work which means using force to move an object over a distance when work is done energy is transferred from one object to another.
what role does temperature play in the growth of bacteria?
Answer:
Every bacterial species has specific growth temperature requirements which is largely determined by the temperature requirements of its enzymes.
Hope this helps..How many atoms are in 80.45 g of magnesium?
Answer:
⬇️
There are 1.9926 * 10 ^24 atoms.
M ( Mg ) = 80.45 g
We can find the molar mass of magnesium in the Periodic table:M ( Mg ) = 24.31 g / molen = 80.45 g :
24.31 g/mole = 3.31 molesN a ( Avogadro`s constant ) = 6.02 * 10 ^23N = Na * n = 6.02 * 10 ^24 * 3.31 = 19.926 * 10 ^24
Hikers have noticed that a sealed bag of potato chips puffs up when taken to the top of a mountain. Suppose that at the valley floor below, the air pressure is 1. 0 atm, temperature is 25°C, and the volume of the chip bag is 0. 985 L. At the top of the mountain, the temperature is 22°C and the chip bag has puffed up to 1. 030 L. What is the air pressure on top of the mountain? atm.
The final pressure of the air at the top of the mountain has been 0.818 atm.
The gas in the sealed potato bag has been assumed to be the ideal gas.
Since, there has been no change in the moles of gas, the relationship of initial temperature, pressure, and volume, and final units has been given as:
[tex]\dfrac{P_1V_1}{T_1}=\dfrac{P_2V_2}{T_2}[/tex]
Computation for the air pressure at top of mountainThe units at valley floor has been considered as initial units, while at the top of mountain are considered as final units.
The pressure at valley floor, [tex]P_1=1\;\rm atm[/tex]The temperature at the valley floor, [tex]T_1=25^\circ \rm C[/tex]The volume at the valley floor, [tex]V_1=0.985\;\rm L[/tex]The temperature at the top of the mountain, [tex]T_2=22^\circ \rm C[/tex]The final volume at the top of the mountain, [tex]V_2=1.03\;\rm L[/tex]Substituting the values for the final pressure of the potato chips puff at the top of the mountain, [tex]P_2[/tex]
[tex]\rm \dfrac{1\;atm\;\times\;0.985\;L}{25^\circ C} =\dfrac{\textit P_2\;\times\;1.030\;L}{22^\circ C} \\\\0.03832=0.0468\;\textit P_2\\\\\textit P_2=0.818\;atm[/tex]
The final pressure of the air at the top of the mountain has been 0.818 atm.
Learn more about pressure, here:
https://brainly.com/question/356585
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