Answer: 2.7 grams
Explanation:
According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products has to be equal to the mass of reactants. The number of atoms of each element has to be same on reactant and product side. Thus chemical equations are balanced.
Given: mass of sodium hydrogen carbonate = 3.4 g
mass of acetic acid = 10.9 g
Mass of reactants = mass of sodium hydrogen carbonate+ mass of acetic acid = 3.4 + 10.9= 14.3 g
Mass of reactants = Mass of products in reaction vessel + mass of carbon dioxide (as it escapes)
Mass of carbon dioxide = 14.3 - 11.6 =2.7 g
Thus the mass of carbon dioxide released during the reaction is 2.7 grams.
Explanation:
Student A would be introducing more error. While student B is subtracting the actual filter paper used in the experiment, Student A is using the mass of a different filter paper, which may have a slightly different mass than the filter paper that was used. To avoid having to aacount for this, or introducing such an error, follow Student B in weighing the filter paper before adding the sand.
I hope this helps.
The relative atomic mass of the element is 15.99 and the element is oxygen.
<h3>What is the relative atomic mass of the element?</h3>
Let us note that owing to the fact that elements often have isotopes, the relative atomic mass is not always a whole number. Now we have tp obtain the relative atomic mas from the atomic masses of the elements.
Thus;
X = (15.99 * 0.99762) + (16.999 * 0.00038) + (17.999 * 0.002)
X = 15.95 + 0.0065 + 0.036
X= 15.99
Thus the relative atomic mass of the element is 15.99 and the element is oxygen.
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They are all part of the same group which is Group 18, otherwise known as the Noble Gases
The balance that can be used to measure a mass reading of 0.90 g will be a balance with ±0.01 g tolerance.
The mass reading balance used for measurement
1.230 g ±0.001 g tolerance
5.43g ±0.01 g tolerance
4.0000g ±0.0001 g tolerance
6.539g ±0.001 g tolerance
<h3>What is the tolerance of a balance?</h3>
The tolerance of a balance is the number of decimal place values shown on the balance and it is the permissible limitations measured in grams, that a balance can tolerate.
- Hence, depending on the decimal place value behind a mass reading will determine the balance used for measurement.
From the given parameters:
The mass reading balance used for measurement
0.90 g ±0.01 g tolerance
1.230 g ±0.001 g tolerance
5.43g ±0.01 g tolerance
4.0000g ±0.0001 g tolerance
6.539g ±0.001 g tolerance
Learn more about tolerance of a balance here:
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