Answer: 6 & 8
Explanation:
I got it correct on my test hope this helped
D...alkaline earth metals<span>
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Answer is: 20.0g H - 20.0 moles; 0.50 g Na - 0.022 moles; 2.0 x 102 mg H2O - 0.011 moles.
1) m(H) = 20.0 g; mass of hydrogen.
n(H) = m(H) ÷ M(H).
n(H) = 20 g ÷ 1 g/mol.
n(H) = 20.0 mol; amount of hydrogen.
2) m(Na) = 0.50 g; mass of sodium.
n(Na) = m(Na) ÷ M(Na).
n(Na) = 0.5 g ÷ 22.98 g/mol.
n(Na) = 0.022 mol; amount of sodium.
3) m(H₂O) = 200 mg ÷ 1000 mg/g.
m(H₂O) = 0.20 g; mass of water.
n(H₂O) = m(H₂O) ÷ M(H₂O).
n(H₂O) = 0.2 g ÷ 18 g/mol.
n(H₂O) = 0.011 mol; amount of water.
Answer:
Explanation:
Process of desalination is used to remove salt from seawater for provision of fresh water
THE DEFINITION OF PHYSICAL CHANGE: Physical changes are changes affecting the form of a chemical substance, but not its chemical composition. Physical changes are used to separate mixtures into their component compounds, but can not usually be used to separate compounds into chemical elements or simpler compounds. so the answer is that the form of the sugar is changing in water but if you boiled the water till its all evaporated all that will be left is the sugar
