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qaws [65]
2 years ago
12

Help me plsssss ))):

Chemistry
2 answers:
Lyrx [107]2 years ago
8 0
It’s c my good guy have a good day
Marysya12 [62]2 years ago
5 0

Answer:

crushing an ice cube

Explanation:

crushing an ice cube can be redone by freezing it again in its position

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A laboratory technician combined sodium hydroxide with excess iron(II) nitrate. A reaction took place according to this chemical
Whitepunk [10]

 The initial  mass  of sodium hydroxide  is  3.3 g (answer C)

 <u><em>calculation</em></u>

Step 1 : find the  moles of iron (ii) hydroxide (  Fe(OH)₂

moles =  mass÷  molar mass

from periodic table the  molar mass of Fe(OH)₂  = 56 + [16 +1]2  = 90 g/mol

moles  is therefore = 3.70 g÷ 90 g/mol = 0.041 moles

Step 2:  use the mole ratio to  calculate the moles of  sodium hydroxide (NaOH)

   from given equation  NaOH : Fe(OH)₂    is 2 :1

therefore the moles of NaOH = 0.041 x 2 = 0.082 moles

Step 3: find  mass of NaOH

mass = moles x molar mass

from the periodic table the  molar mass of NaOH = 23 +16 +1  = 40 g/mol

mass  = 0.082  moles x 40 g/mol = 3.3 g ( answer C)


8 0
3 years ago
help please, How much water would you need to add to the 10 grams of sodium hydroxide to make 100 grams of the 10% solution?
jonny [76]

Answer:

90

Explanation:

gshhhshussussussjsuushhshjssuss

5 0
3 years ago
How many significant figures are in the mass 3.0047 g?
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Answer:

5 significant figures

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3 years ago
QUICK (lots of points) How many lone pairs are present in Xylene?!
Snezhnost [94]

i dont think their are a exact number

7 0
3 years ago
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Consider the bonds in iron(III) oxide. Are the bonds more ionic or more covalent?
kvv77 [185]
<span>the bonds in iron(III) oxide are more ionic</span>
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3 years ago
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