The atomic number of oxygen is 8, because oxygen has eight protons in the nucleus.
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the correct setup is shown at bottom of your question
we get
total moles*(1/102.0 g/mol)= total grams Al2O3
hope this helps. any questions please ask. thank you kindly
KCO₂
K₂C₂O₄
Explanation:
Given parameters:
Percent composition:
K = 47%
C = 14.5%
O = 38.5%
Molar mass of compound = 166.22g/mol
Unknown:
Empirical formula of compound = ?
Molecular formula of compound = ?
Solution:
The empirical formula of a compound is its simplest formula. Here is how to solve for it:
K C O
Percent
composition 47 14.5 38.5
Molar mass 39 12 16
Number
of moles 47/39 14.5/12 38.5/16
moles 1.205 1.208 2.4
Dividing
by smallest 1.205/1.205 1.208/1.205 2.4/1.205
1 1 2
Empirical formula KCO₂
Molecular formula
This is the actual combination of the atoms:
Molecular formula = ( empirical formula of KCO₂)ₙ
Molar mass of empirical formula = 39 + 12 + 2(16) = 83g/mol
n factor =
n factor = = 2
Molecular formula of compound = ( KCO₂)₂ = K₂C₂O₄
Learn more:
Empirical formula brainly.com/question/2790794
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Answer:
9.0 L.
Explanation:
- To solve this problem, we should use the general gas law of ideal gas:
PV = nRT.
where,
P is the pressure of the gas in (atm).
V is the volume of the gas in (L).
n is the no. of moles of the gas (mol).
R is the general constant for gases (R = 0.082 L.atm/mol.K).
T is the temperature of the gas in (K).
- Since the P, T and R are constants, the variables are V and n.
<em>∴ V₁n₂ = V₂n₁.</em>
V₁ = 6.0 L & n₁ = 0.50 mol.
V₂ = ??? L & n₂ = 0.75 mol.
∴ V₂ = (V₁n₂) / (n₁) = (6.0 L)(0.75 mol) / (0.50 mol) = 9.0 L.
Answer:
It does not change the identity of a substance. Sugar if dissolved in water is still sugar.
Explanation: