M(H₂O) = 97,2 g.
n(H₂O) = m(H₂O) ÷ M(H₂O).
n(H₂O) = 97,2 g ÷ 18 g/mol.
n(H₂O) = 5,4 mol.
N(H₂O) = n(H₂O) · Na.
N(H₂O) = 5,4 mol · 6,023·10²³ 1/mol.
N(H₂O) = 3,25·10²⁴ molecules of water.
n - amount of substance.
Na - Avogadro number.
To identify the amount of chloride ions present in 0.1 mol
of MgCl2, first know the amount of mols of Chloride. The answer is 0.2 mol
since you just need to multiply 0.1 to 2 because there are 2 chloride in the
compound. Then, multiply the mols to 6.02x10^23. The answer would be
1.204x10^23 chloride ions.
Answer: Approximately ![0.48 \times 10^{-2} \ \text{ mole}](https://tex.z-dn.net/?f=0.48%20%20%5Ctimes%2010%5E%7B-2%7D%20%5C%20%5Ctext%7B%20mole%7D)
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Explanation:
There are roughly 6.02 * 10^23 atoms in one mole of any element. So we have 6.02 * 10^23 atoms in one mole of nitrogen.
We can then do the following conversion:
![\left(2.9 \times 10^{21} \ \text{ atoms of nitrogen} \right)\times \left(\frac{1 \ \text{ mole}}{6.02 \times 10^{23} \ \text{ atoms}}\right)\\\\\frac{2.9 \times 10^{21}}{6.02 \times 10^{23}} \ \text{ mole}\\\\\frac{2.9}{6.02} \times 10^{21-23} \ \text{ mole}\\\\0.48172757 \times 10^{-2} \ \text{ mole}\\\\0.48 \times 10^{-2} \ \text{ mole}\\\\](https://tex.z-dn.net/?f=%5Cleft%282.9%20%5Ctimes%2010%5E%7B21%7D%20%5C%20%5Ctext%7B%20atoms%20of%20nitrogen%7D%20%5Cright%29%5Ctimes%20%5Cleft%28%5Cfrac%7B1%20%5C%20%5Ctext%7B%20mole%7D%7D%7B6.02%20%5Ctimes%2010%5E%7B23%7D%20%5C%20%5Ctext%7B%20atoms%7D%7D%5Cright%29%5C%5C%5C%5C%5Cfrac%7B2.9%20%5Ctimes%2010%5E%7B21%7D%7D%7B6.02%20%5Ctimes%2010%5E%7B23%7D%7D%20%5C%20%5Ctext%7B%20mole%7D%5C%5C%5C%5C%5Cfrac%7B2.9%7D%7B6.02%7D%20%20%5Ctimes%2010%5E%7B21-23%7D%20%5C%20%5Ctext%7B%20mole%7D%5C%5C%5C%5C0.48172757%20%20%5Ctimes%2010%5E%7B-2%7D%20%5C%20%5Ctext%7B%20mole%7D%5C%5C%5C%5C0.48%20%20%5Ctimes%2010%5E%7B-2%7D%20%5C%20%5Ctext%7B%20mole%7D%5C%5C%5C%5C)
Answer:
ions; when atom lose or gain electron
Explanation:
when an atom lose electron it becomes positive ion (cation) when an atom gain electron it becomes negative ion(anion)
isotope has same number of atomic number (proton) but different neutron number which affects mass number
Answer:
Cancer
Explanation:
Cancer is a genetic disease—that is, it is caused by changes to genes that control the way our cells function, especially how they grow and divide. Genetic changes that cause cancer can happen because: of errors that occur as cells divide.