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3 years ago

How many nickels are in 3 rolls of nickels

Chemistry

2 answers:

mafiozo [28]3 years ago

7 0

Answer: 120

Explanation: cause google

oee [108]3 years ago

3 0

1 roll of nickels has 40 nickles.

40 * 3 = 120

120 nickels in 3 rolls of nickels.

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In the reaction MgCl2 + 2KOH Mg(OH)2 + 2KCl, how many moles of Mg(OH)2 are produced for every mole of MgCl2?. A. 3. B. 1. C. 2.

aksik [14]

Mole ratio:

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1 mole MgCl₂ -------------- 1 mole Mg(OH)₂

Answer B

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denis23 [38]

Answer :

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$\nu=\frac{c}{\lambda}$

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Now put all the given values in the above formula, we get:

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(2) Now we have to calculate the energy of photon.

Formula used :

$E=h\times \nu$

where,

$\nu$ = frequency of photon

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Now put all the given values in the above formula, we get:

$E=(6.626\times 10^{-34}Js)\times (3\times 10^{10}s^{-1})$

$E=1.988\times 10^{-23}J/photon$

The energy of a single photon of this radiation is $1.988\times 10^{-23}J/photon$

(3) Now we have to calculate the energy in J/mol.

$E=1.988\times 10^{-23}J/photon$

$E=(1.988\times 10^{-23}J/photon)\times (6.022\times 10^{23}photon/mol)$

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expeople1 [14]

Answer:

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