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Anastasy [175]
2 years ago
7

3. In a neutral atom, this element has an atomic mass of 23 AMU and has 11 protons.

Chemistry
1 answer:
notka56 [123]2 years ago
4 0

The element in question is Sodium

An atomic mass unit is defined as 1/12 th of the mass of carbon-12 atom.

The mass of an atom is mainly due to its protons and neutrons in the nucleus.

Weight of a proton is 1.6 x 10^-27 kg

Weight of a neutron is 1.6 x 10^-27kg

However weight of an electron is 9 x 10^-31kg and hence is negligible in calculation of amu

It is given that weight is 23 AMU and number of protons is 11

The protons in a nucleus also act as atomic number of the periodic table

Proton number 11 is the atomic number of Sodium

Hence the element is Sodium

For further reference:

brainly.com/question/13668134?referrer=searchResults

#SPJ9

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Adding vinegar to baking soda will cause a chemical reaction. Which of these will speed up the reaction?
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What is the name for Cl₇Br₄ *
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The substance water always has a mass ratio of 11% H to 89% O. If 5.00g of a substance containing H and O was decomposed into .2
Gre4nikov [31]

Answer:

                    No the substance is not water.

Explanation:

                   The balance chemical equation for the decomposition of water is as follow;

                                           2 H₂O = 2 H₂ + O₂

Step 1: <u>Calculate moles of H₂O;</u>

               Moles  =  Mass / M.Mass

               Moles  =  5.0 g / 18.01 g/mol

               Moles  =  0.277 moles of H₂O

Step 2: <u>Calculate Moles of O₂ and H₂ produced by 0.277 moles of H₂O:</u>

According to equation,

                        2 moles of H₂O produced  =  1 mole of O₂

So,

                  0.277 moles of H₂O will produce  =  X moles of O₂

Solving for X,

                     X =  0.277 mol × 1 mol / 2 mol

                     X =  0.138 moles of O₂

Also,

According to equation,

                        2 moles of H₂O produced  =  2 mole of H₂

So,

                  0.277 moles of H₂O will produce  =  X moles of H₂

Solving for X,

                     X =  0.277 mol × 2 mol / 2 mol

                     X =  0.227 moles of H₂

Step 3: <u>Calculate Mass of O₂ and H₂ as;</u>

For O₂:

                 Mass  =  Moles × M.Mass

                 Mass  =  0.138 mol × 31.99 g/mol

                 Mass  =  4.44 g of O₂

For H₂:

                 Mass  =  Moles × M.Mass

                 Mass  =  0.227 mol × 2.01 g/mol

                 Mass  =  0.559 g of H₂

Conclusion:

                   From conclusion it is proved that the amount of H₂ produced by decomposition of 5 g of water should be 0.559 g while in statement it is less i.e. 0.290 g.

6 0
3 years ago
I don’t understand this question
zhannawk [14.2K]
Since they both have the same momentum, the object with the larger mass has a small velocity. (Remember that mass and velocity are inversely proportional with
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