Directions: Identify each chemical equation as a synthesis, decomposition,
1 answer:
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Answer:
0.5 M
Explanation:
First we have to start with the <u>molarity equation</u>:
We need to know the<u> amount of moles and the litters</u>.
If we have 100 mL we can convert this value to “L”, so:
Now we can continue with the moles, for this we have to know the <u>formula of sodium sulfate</u> , with this formula we can <u>calculate the molar mass</u> if we know the atomic mass of each atom on the formula (Na: 23 g/mol, S: 32 g/mol, O: 16 g/mol). We have to multiply each atomic mass by the amount of atoms in the formula, so:
In other words:
Now we can <u>calculate the moles</u>:
Finally, we can <u>calculate the molarity:</u>
I hope it helps!
Answer:
1.88 x 10²³molecules of H₂O
Explanation:
Given parameters:
Mass of H₂O = 5.609g
Unknown:
Number of molecules of H₂O = ?
Solution:
To solve this problem, we need to find the number of moles of given compound first.
Number of moles =
Molar mass of H₂O = 2(1) + 16 = 18g/mol
Number of moles = = 0.31mole
From mole concept;
1 mole of a substance contains 6.02 x 10²³molecules
0.31 mole of H₂O will therefore contain 0.31 x 6.02 x 10²³molecules
= 1.88 x 10²³molecules of H₂O