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Sonja [21]
2 years ago
15

Express the following in scientific notation: 1. 158000 km 2. 0.000009782 L

Chemistry
1 answer:
slamgirl [31]2 years ago
6 0

Answer:

1.58x10^5km

9.782x10^-6

Explanation:

Please Brainlist

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

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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

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

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8 0
3 years ago
If 15.00 mL of 0.0100 M Ca(IO3)2 solution are mixed with 0.500 g KI, what is the theoretical yield (in grams) of I2?
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The theoretical yield of I2 in the reaction would be 0.23 g

<h3>Theoretical yield</h3>

This refers to the stoichiometric yield of a reaction.

From the equation of the reaction:

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More on stoichiometric calculations can be found here: brainly.com/question/6907332

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