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Reika [66]
2 years ago
5

Select each correct answer. More than one answer may be correct. Four atoms of hydrogen combine with one carbon atom to form CH4

, but only two hydrogen atoms combine with one oxygen atom to form H2O. Which of the following helps to explain why? Hydrogen has one valence electron. Metallic bonds form between positively charged metal ions and delocalized electrons. Atoms may share electrons in order to fill their electron shells. Oxygen has two vacancies in its electron shell, but carbon has four vacancies.
Chemistry
1 answer:
Ivan2 years ago
6 0
It’s the mentioning the amount of valence electrons in hydrogen, and the one about electrons share electrons to fill their shells.
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Explanation:

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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]

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 <u><em>calculation</em></u>

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

moles =  mass÷  molar mass

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

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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

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