Carbon 12 and carbon 13 are two naturally occurring isotopes of the element. Carbon 12 accounts for approximately 98.9 percent of naturally occurring carbon while carbon 13 accounts for approximately 1.1 percent. Therefore if a sample has 10,000 atoms, 9890 atoms would be carbon 12 and 110 atoms would be carbon 13.
Answer:
When an apple is cut or bruised the oxygen goes into the injured plant tissue. It begins to oxidize from the reaction of the enzymes and oxygen. The apple produces melanin to protect it causing it to brown. Using vinegar and lemon juice help stop the browning because lemon juice has a compound that reacts with oxygen before the oxygen can react with apple. Also, vinegar and lemons are very acidic which slows the browning reaction.
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The amount of moles in 3.34 x10³⁴ formula unit of Cu(OH)₂ is 5.55 × 10¹⁰ moles
<u><em>calculation</em></u>
The amount of moles is calculated using the Avogadro's law constant
That is 1 moles = 6.02 × 10²³ formula units
? moles = 3.34 × 10³⁴ formula units
<em>by cross multiplication</em>
= {1 mole ×3.34 ×10³⁴ formula units ] / 6.02 × 10²³ formula units} = 5.55 ×10¹⁰ moles
D - density: 1 g/cm³
m - mass: 2,89g
V - volume: ?
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d = m/V
V = m/d
V = 2,89/1
V = 2,89cm³
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