Hey there!:
Wavelength λ = 0.650 fm = 0.650* 10⁻¹⁵ m (1 fm = 10⁻¹⁵ m)
Speed v = 129 m/s⁻¹
Planck constant h = 6.626 * 10⁻³⁴ J.s
De Broglie equation: λ = h/mv
Mass m = h/λv
= 6.626 * 10⁻³⁴/ ( 0.650* 10⁻¹⁵ * 129)
= 6.626*10⁻³⁴ / 8.385*10⁻¹⁴
= 7.902*10⁻²¹ Kg
Hope that helps!
<span>6.
Because the general formula for alkenes is CnH2n</span>
Answer:
mass, space, composition, changes, 5, carbon, carbon, organisms, analytical chemistry, physical chemistry, energy transfer, two
Explanation:
arts Per Thousand ... Click advance year 10 times. ... Which organism was most hurt by increased storms, and why do you think this is so? ... On the Coral Reef tab I see less fish and on the Data tab I see Staghorn Coral has majorly decreased. ... B. How does this change the populations of the two species that eat algae, ...
Answer:
a. Endothermic
b. 26.37kJ/mol
Explanation:
a. As we can see, the temperature of the water is decreasing when the reaction is occurring, that means the reaction is absorbing heat and is endothermic
b. To find the enthalpy we must find the change in heat when 12.1g of KCl are dissolved. Using the equation:
Q = -m*ΔT*C
<em>Where Q is change in heat</em>
<em>m the mass of solution (250g + 12.1g = 262.1g)</em>
<em>ΔT is change in heat (17.1°C - 21.0°C = -3.9°C)</em>
<em>And C is specific heat of the solution (4.184J/g°C assuming is the same than the specific heat of water).</em>
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Replacing:
Q = -262.1g*-3.9°C*4.184J/g°C
Q = 4277J = 4.28kJ
As reaction enthalpy is the change in heat per mole of reaction, we must find the moles of 12.1g of KCl:
<em>Moles KCl -Molar mass: 74.55g/mol-:</em>
12.1g KCl * (1 mol / 74.55g) = 0.1623 moles KCl
The reaction enthalpy us:
4.28kJ / 0.1623mol = }
<h3>26.37kJ/mol</h3>
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