Answer:
=11189 J
Explanation:
The temperature change i caused by the enthalpy change of the sand and the consequent increase in kinetic energy.
Change in enthalpy= Mass of substance × Specific heat capacity× Temperature change.
ΔH= MC∅
M=1000.0g
C= 0.670 Jg°C
∅= 37.8°C-21.1°C=16.7°C
ΔH= 1000.0g × 0.670J/g°C × 16.7 °C
=11189 J
Therefore the heat supplied to raise the temperature from 21.1 °C to 37.8°C is 11189 J.
If 45.0 mL of 0.25 M HCl is required to completely neutralize 25.0 mL of NH3, what is the concentration of the NH3 solution? Show all of the work needed to solve this problem.
HCl + NH3 yields NH4Cl
molar concentration = number of moles / volume
number of moles = molar concentration × volume
Number of moles of HCl = 0.25 × 45 = 11.25 mmoles
From the reaction:
11.25 mmoles of HCl will neutralize 11.25 mmoles of NH₃
Molar concentration of NH₃ solution = 11.25 / 25 = 0.45 M
Answer:
The balanced chemical equation is
[tex]1HCl+1NH_3>1NH_4 Cl[/tex]
The conversions are
Molarity of HCl and volume gives us moles HCl
Moles HCl to moles [tex]NH_3[/tex] (using mole ratio 1 : 1)
Moles [tex]NH_3[/tex] to Molarity [tex]NH_3[/tex]
Molarity HCl = (moles solute HCl) / (volume of solution in L)
Rearranging the formula
We get moles HCl = Molarity × volume
[tex]=0.25M \times 45.0mL = 0.25 mol/L \times 0.045L = 0.01125 mol HCl[/tex]
moles HCl = moles [tex]NH_3[/tex] = 0.01125 mol [tex]NH_3[/tex]
Molarity [tex]NH_3[/tex] =(moles solute [tex]NH_3[/tex]) / (volume of solution in L)
[tex]=\frac {(0.01125 mol )}{25.0mL} = \frac {(0.01125 mol )}{0.025L}[/tex]
=0.450 mol/L or M (Answer)
___________. Is a process that breaks water down into the gases hydrogen and oxygen
The answer is electrolysis
Answer:
Water electrolysis
Explanation:
How long would it take a typical jet to travel the sun from earth?
Answer:
To travel this far, it would take 19 years.
What is the purpose of a unit conversion?
The unit conversion is a fundamental process that enables accurate and coherent communication and computation across various fields and applications.
Unit conversion maintains a quantity's value in different units, crucial for consistency and clarity.
It enables comparisons between measurements using diverse units.
Facilitates communication across different measurement systems.
Ensures meaningful and applicable calculation results in various contexts.
For instance, converting grams to ounces allows accurate measurement in recipes using different units.
[tex]\[ 500 \text{ grams} \times 0.035 \frac{\text{ounces}}{\text{gram}} = 17.5 \text{ ounces} \][/tex]
For the recipe, 17.5 ounces of flour are needed for precise measurement.
In scientific research, unit conversion is vital for standardizing data presentation.
International trade relies on unit conversion to ensure consistent pricing across different measurement systems.
Overall, unit conversion is fundamental for accurate communication and computation in diverse fields and applications.
NF3 has three F atoms bonded to a central N atom, with one lone electron
pair on the N. What is the shape of this molecule?
O
A. Tetrahedral
O
B. Trigonal planar
O
C. Bent
O
D. Trigonal pyramidal
D Trigonal pyramidal
Explanation:
NF3 exhibits a trigonal pyramidal shape due to its sp³ hybridization, with three bonded fluorine atoms and one lone pair of electrons on the nitrogen atom.
Explanation:The molecule in question is NF3, which consists of one nitrogen atom (N) and three fluorine atoms (F). The nitrogen atom in NF3 is sp³ hybridized, utilizing one sp³ hybrid orbital to form a bond with each of the three fluorine atoms, and the remaining sp³ hybrid orbital accommodates a lone pair of electrons. Considering the presence of three bonded pairs and one lone pair of electrons on the nitrogen atom, the molecular geometry of NF3 is trigonal pyramidal. This geometric shape resembles a tetrahedron with one vertex missing, due to the presence of the lone electron pair on nitrogen, which slightly distorts the angles between the bonds.