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2 years ago

What mass of Hg will occupy a volume of 75.0 mL?

1 answer:

7 0

75.0 mL in liters:

75.0 / 1000 => 0.075 L

1 mole -------------------- 22.4 L ( at STP)
( moles Hg) ------------- 0.075 L

moles Hg = 0.075 x 1 / 22.4

moles = 0.075 / 22.4

= 0.00334 moles of Hg

Hg => 200.59 u

1 mole Hg ----------------- 200.59 g
<span>0.00334 moles Hg ----- ( mass Hg )
</span>
mass Hg = 200.59 x 0.00334 / 1

mass Hg = 0.6699 / 1

= 0.6699 g of Hg

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Which of the following are not single-displacement reactions?

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Answer:

$\boxed{\text{B and C }}$

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In a single-displacement reaction, one element exchanges partners with another element in a compound.

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This is a single-displacement reaction, because the element Fe exchanges partners with H in HCl.

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$\textbf{D. } \rm Ca + 2HOH \longrightarrow Ca(OH)_2 + H_2$

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2 years ago

Caffeine, a stimulant found in coffee and soda, has the following elemental composition: 49.48% carbon, 5.19% hydrogen, 16.48% o

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Answer:

Explanation:

C = 49.48

H = 5.19

O = 16.48

N = 28.85

ratio of moles

= 49.48 / 12 : 5.19 / 1 : 16.48 / 16 : 28.85 / 14

= 4.123 : 5.19 : 1.03 : 2.06

= 4 : 5 : 1 : 2

so the empirical formula = C₄ H₅O N₂

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