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3 years ago

What is the de broglie wavelength of a 0.17-kg hockey puck moving at 37 m/s ?

1 answer:

5 0

Im taking lambda as x (wavelength)

m = 0.17 kg

v=37m/s

h=6.62*10^-34m²kg/s

x= h/mv

$x = 6.62 \times 10 ^{ - 34} \div 0.17 \times 37$
$x =1.05 \times {10}^{ - 34} m$

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KatRina [158]

Explanation:

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3 years ago

Calculate [H3O+] and [OH−] for each of the following solutions at 25 ∘C given the pH.<br> pH= 2.89

dimaraw [331]

Answer: The value of $[H_{3}O^{+}]$ is 0.0012 M and $[OH^{-}]$ is $1.02 \times 10^{-14}$ .

Explanation:

pH is the negative logarithm of concentration of hydrogen ion.

It is given that pH is 2.89. So, the value of concentration of hydrogen ions is calculated as follows.

$pH = - log [H^{+}]\\2.89 = - log [H^{+}]\\conc. H^{+} = 0.0012 M$

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pH + pOH = 14

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pOH = 14 - 0.0012 = 13.99

Now, pOH is the negative logarithm of concentration of hydroxide ions.

Hence, $[OH^{-}]$ is calculated as follows.

$pOH = - log [OH^{-}]\\13.99 = - log [OH^{-}]\\conc. OH^{-} = 1.02 \times 10^{-14} M$

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3 years ago

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3 years ago

Identify the limiting reactant when 7.81 g of HCl reacts with 5.24 g of NaOH to produce NaCl and H2O

elena55 [62]

Answer:

NaOH is limiting

Explanation:

Hcl + NaOH ------------ Nacl + H2O

Given 7.81g 5.24g

mol weights 1+35.5 23+16+1

36.5 40

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No of moles = weight/ molecular weight

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-------- represents arrow in forward direction in equation

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Answer:

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