The correct answer choice from the statement above about investigated factors from lab results is :
Students who spend less time studying after school get lower math grade
Option D is the correct answer
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So therefore, The correct answer choice from the statement above about investigated factors from lab results is :
Students who spend less time studying after school get lower math grade
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Answer: 2moles
Explanation:
The best way to solve this problem is to write a balance equation for the reaction.
Which is: Fe2 + 2i2______> 2Fei2
With this you can see that iron ii reacting with excess iodine produces two (2) moles of iron ii iodine.
Alternatively.
Using the formular
Moles = reacting mass/molar mass
Reacting mass = 112g
Molar mass of iron ii = 55g/mol
Hence,
Mole = 112g divides 55g/mol
= 2.0mol//
The balanced equation for the burning of N-butane is;
2C₄H₁₀ + 13O₂ → 8CO₂ + 10H₂O
stoi. ratio 2 : 13 : 8 : 10
molar mass 58 32 44 18
moles X 13 X/2 8X/2 10X/2
105.86 688.10 423.45 529.31
produced mass 18632.8 g 9527.6 g
moles of n-butane = X = 6.14 x 10³ g / 58 g mol⁻¹
hence other moles of compounds can be calculated.
Mass = molar mass * moles
mass fraction = mass / total mass
hence the mass fraction of
CO₂ = 18632.8 / 6.14 x 10³ = 3.03
H₂O = 9527.6 / 6.14 x 10³ = 1.55
the required mass of air = 688.10 x 32 = 22019.2 g = 2.20 kg
Answer:
Na F
Explanation:
because electrovalent bond is present between them