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Vlada [557]
3 years ago
6

A photon of light produced by a surgical laser has a wavelength of

Chemistry
1 answer:
krok68 [10]3 years ago
3 0

Answer:

E =  0.024 ×10⁻¹⁷ J

Explanation:

Given data:

Wavelength of photon = 821 nm (821 ×10⁻⁹ m)

Energy of photon = ?

Solution:

Formula:

E = hc/λ

h = plancks constant = 6.626×10⁻³⁴ Js

c = speed of light = 3×10⁸ m/s

by putting values

E = 6.626×10⁻³⁴ Js × 3×10⁸ m/s / 821 ×10⁻⁹ m

E = 19.878×10⁻²⁶ J.m/ 821 ×10⁻⁹ m

E =  0.024 ×10⁻¹⁷ J

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If an M&amp;M weighs 0.88 grams, how much would a mole of M&amp;Ms<br> weigh?
Snezhnost [94]

Answer:

5.30x10²³g

Explanation:

A mole can be understood as an amount of something.

One mole of eggs are 6.022x10²³ eggs

One mole of atoms are 6.022x10²³ atoms

One mole of molecules are 6.022x10²³ molecules

And 1 mole of M&M are 6.022x10²³ M&M. As 1 M&M weighs 0.88g, 1 mole will weigh:

0.88g*6.022x10²³ =

<h3>5.30x10²³g</h3>
7 0
4 years ago
Ayo that was cool, ya'll amazing. <br><br> Another one. Next one gonna be 10 points.
Arisa [49]
Person above is correct
7 0
3 years ago
How much Ca(NO3)2 should be weighed out to have 0.650 mol?A) 66.4 g.B) 97.68.C) 107 g.D) 133 g.E) 165 g.
Bogdan [553]

Answer:

C) 107 g

Explanation:

Step 1: Calculate the molar mass of Ca(NO₃)₂

We can calculate the molar mass of Ca(NO₃)₂ by adding the masses of its elements.

M = 1 × Ca + 2 × N + 2 × 3 × O

M = 1 × 40.08 g/mol + 2 × 14.01 g/mol + 6 × 16.00 g/mol

M = 164.10 g/mol

Step 2: Calculate the mass corresponding to 0.650 moles of Ca(NO₃)₂

We multiply the number of moles by the molar mass.

0.650 mol × 164.10 g/mol = 107 g

6 0
4 years ago
What is 2.75 mol of O2
ANTONII [103]

Answer:

2,75 mol of O2 it's 88 g of O2.

Explanation:

The weight of the diatomic molecule O2 is 32 g/mol. So considering that, you should multiply 2,75 mol · 32 = 88g :)

3 0
3 years ago
Plz help me
german

6.6 g

Explanation:

The mole ration between CaCO₃and CO₂ is 1 : 1

Because the molar mass of CaCO₃ is 100.0869 g/mol the amount of moles used in this chemical reaction is;

15/ 100

This will be similar to the moles of CO₂

Because the molar mass of CO₂ is 44g, then well multiply by the moles;

15/100 * 44

= 6.6 g

7 0
3 years ago
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