Chemistry, 24.07.2019 01:30 brionnashelp

The frequency of a photon that has an energy of 3.7 × 10-18 j is s-1.

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Answer from: mv603177

The frequency of the photon is $5.58\times 10^{15}s^{-1}$

Explanation:

The relationship between energy and frequency is given by Planck's equation, which is:

$E=h\nu$

where,

h = Planck's constant = $6.626\times 10^{-32}Js$

E = energy of the photon = $3.7\times 10^{-18}J$

$\nu$ = frequency of photon = ?

Putting values in above equation, we get:

$3.7\times 10^{-18}J=6.626\times 10^{-34}Js\times \nu\\\\\nu=\frac{3.7\times 10^{-18}J}{6.626\times 10^{-34}Js}=5.58\times 10^{15}s^{-1}$

Hence, the frequency of the photon is $5.58\times 10^{15}s^{-1}$

Answer from: Quest

when 25.0 ml of 0.700 mol/l naoh was mixed in a calorimeter with 25.0 ml of 0.700 mol/l hcl, both initially at 20.0 °c, the temperature increased to 22.1 °c. the heat capacity of the calorimeter is 279 j/°c.

the equation for the reaction is:

naoh + hcl → nacl + h₂o

moles of hcl = 0.0250 l hcl ×

0.700

mol hcl

1 l hcl = 0.0175 mol hcl

volume of solution = (25.0 + 25.0) ml = 50.0 ml

mass of solution = 50.0 ml soln ×

1.00

ml soln

= 50.0 g soln

δt=t2-t1

= (22.1 – 20.0) °c = 2.1 °c

the heats involved are

heat from neutralization + heat to warm solution + heat to warm calorimeter = 0

q1+q2+q3=0

nδh+mcδt+cδt=0

0.0175 mol ×

δh

+ 50.0 g × 4.184 j·g⁻¹°c⁻¹ × 2.1 °c + 279 j°c⁻¹ × 2.1 °c = 0

0.0175 mol ×

δh

+ 439.32 j + 585.9 j = 0

0.0175 mol ×

δh

= -1025.22 j

δh=1025.22j0.0175 mol= -58 600 j/mol = -58.6 kj/mol

Answer from: Quest

Mass is the amount of matter in an object. weight is the measurement of the pull of gravity on an object. say for example, you travel to the moon which has a different gravitational field compared to the gravitational field of earth. (gravitational fields: earth = 1, moon = 0.165) now when you are on the moon, the pull of gravity on you is different than on the earth. and as weight is the measurement of the pull of gravity on an object, that means yes, your weight can and will change on the moon. however, on the moon, on earth or even on jupiter, the amount of mass inside of you remains the same. meaning your physical mass remains constant. in conclusion it is possible for your weight to change as your mass remains constant.

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