Guys can you help me please it’s due today
2 answers:
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Answer:
Explanation:
We are asked to find how many molecules are in 3.6 grams of sodium chloride.
<h3>1. Convert Grams to Moles </h3>First, we convert grams to moles using the molar mass. These values are equivalent to atomic masses on the Periodic Table, but the units are grams per moles instead of atomic mass units. Look up the molar masses of the individual elements: sodium and chlorine.
- Na: 22.9897693 g/mol
- Cl: 35.45 g/mol
There are no subscripts in the chemical formula (NaCl), so we simply add the 2 molar masses.
- NaCl: 22.9897693 + 35.45 = 58.4397693 g/mol
Now we will convert using dimensional analysis. First, set up a ratio using the molar mass.
We are converting 3.6 grams to moles, so we must multiply the ratio by this value.
Flip the ratio so the units of grams of sodium chloride cancel.
Next, we convert moles to molecules using Avogadro's Number. This is 6.022 × 10²³ and it tells us the number of particles (atoms, molecules, formula units, etc). In this case, the particles are molecules of sodium chloride. Let's set up another ratio.
Multiply by the number of moles we calculated.
The units of moles of sodium chloride cancel.
The original measurement of grams (3.6) has 2 significant figures, so our answer must have the same. For the number we found, that is the tenths place. The 0 in the hundredth place tells us to leave the 7 in the tenth place.
There are in 3.6 grams and the correct answer is choice D.
Answer:
Explanation:
Hello,
In this case, it is widely known that when measurements with different significant figures are put under mathematical operations, the final result must be displayed with the same amount of significant figures of the shortest measurement, thus, due to the fact that 5.5 g has two significant figures only the result is consequently shown with two significant figures as well as shown down below:
By rounding the first six to seven due to the fact that the next six is greater than five, according to rounding rules, the result is:
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