Answer:
2.63g
This means that every mole of water molecules will contain 2 moles of hydrogen and 1 mole of oxygen atoms.
To find the percent composition of hydrogen in water, use the molar mass of water and that of hydrogen
2×1.00794g/mol18.0153g/mol×100=11.19%
This means that every 100 g of water will contain a total of 11.19 g of hydrogen. Since your sample has a mass of 23.5 g, it follows that it will contain
23.5g water⋅11.19 g H100g water=2.63 g H
Statement:
The best way to measure the mass of an orange is to use a balance. You put the orange and the mass pieces in the same cup on the balance and find out how many centimeters it is. The mass of my orange was 145.
Explanation:
Problem 1
The student has not done a good job in measuring the weight of the orange. In fact, the has complicated his simple problem.
Reasons:
- Using the mass pieces and the cup to find the weight of the orange is wrong approach.
He can easily place the orange on the balance and read off the weight.
- Centimeters is a unit of length. What length is he measuring and recording?
The unit of weight is in newtons(N).
- Mass is not read from a balance. A balance gives the weight of substance. Mass is different from weight.
Problem 2
Rewriting to paragraph to correct the errors:
The best way to measure the mass of an orange is to use a balance. You put the orange on the balance and find out how many newtons it is. The weight in newtons can be converted to mass in kilogram. The mass of my orange will be 145kg.
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The element "X" is "O" (oxygen).
<h3>Calculation:</h3>
Given,
Chemical formula = Na₂CX₃
Formula mass = 106 amu
Molar mass of Na = 23 amu
Molar mass of C = 12 amu
To find,
Element X =?
We will equate the equation as follows,
2(23) + 12 + 3(y) = 106
46 + 12 + 3y =106
58 + 3y = 106
3y = 106 - 58
3y = 48
y = 48/3
y = 16
We know that Oxygen has molecular mass of 16. Therefore the element "X" is "O".
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The nucleus of the atom is the heaviest part of the atom.
- The nucleus consists of neutrons and protons
- Both neutrons and protons have masses, but only protons have charges
- The nucleus contains all the positive charges of an atom
- The mass of an atom is the sum of the numbers of protons and neutrons in a nucleus
When the ratio of neutrons to protons is too high, the nucleus becomes unstable and Beta emission has to take place.
- In beta emission, an extra neutron gives rise to a proton and an electron
- The electron is ejected from the nucleus
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