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Phantasy [73]
3 years ago
13

A student gains 1.0 lb in two weeks. How many grams did he gain?

Chemistry
2 answers:
Verdich [7]3 years ago
7 0
1lb= 453.592g but then to change to 2 significant figures you go down two of the numbers so here it will be 4 and 5 that stands for 450g. So he gained 450g. I hope that helped
OlgaM077 [116]3 years ago
3 0
1 lb=453.592 grams
So he gained 453.592 pounds
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Calculate the number of C, H, and O atoms in 1.50 g of glucose, a sugar
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Chemical formula of the glucose: C₆H₁₂O₆

We calculate the molar mass:
atomic mass (C)=12 u
atomic mass (H)=1 u
atomic mass (O)=16 u

atomic weight (C₆H₁₂O₆)=6(12 u)+12(1u)+6(16 u)=72 u+12u+96 u=180 u.
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2) we calculate the number of moles of 1.5 g.
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1.5 g----------------------  x

x=(1.5 g * 1 mol) / 180 g≈8.33*10⁻³ moles

we knows that:
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3)We calculate the number of molecules:

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1 mol-----------------------6.022*10²³ molecules of glucose
8.33*10⁻³ moles--------        x

x=(8.33*10⁻³ moles * 6.022*10²³ molecules)/1 mol≈5.0183*10²¹ molecules.

4)We calculate the number of C, H and O atoms:
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number of atoms of H=(12 atoms/1 molecule)(5.0183*10²¹ molecules)≈
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number of atoms of O=(6 atoms/1 molecule)(5.0183*10²¹ molecules)≈
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Answer: we have 3.011*10²² atoms of C, 6.022*10²² atoms of H, and 3.011*10²² atoms of O.
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