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mash [69]
3 years ago
7

1, 2 and 3 ........

Chemistry
1 answer:
Orlov [11]3 years ago
8 0
2.) Average atomic mass =Σ (abundance x molar mass) /100 = (12.64 x 302.04 + 18.23 x 304.12 + 69.13 x 305.03) /100 =304.486 u(Dalton) . This is avg atomic mass.

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Calculate the amount of heat associated with cooling a 350.0 g aluminum bar from 70.0 oC to 25.0 oC. The specific heat of alumin
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Explanation:

q = 350 \times0.897 \times  (70 - 25)  \\ q = 14127.75

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A compound has a molecular weight of 12.124 atomic mass units and the empirical formula C3H40. What is the molecular formula of
stepladder [879]

Answer:

the empirical formula gives the simplest ratio of whole numbers of components in the compound. Molecular formula gives the actual composition of elements in the compound.

Explanation:

empirical formula - CH₂O

Mass of one empirical unit = 12 + (1x2) + 16 = 30 a.m.u

We have to next calculate how many empirical units make up the molecular formula. For that we have to divide molecular mass by mass of one empirical unit.

Number of empirical units = 180 a.m.u / 30 = 6

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Therefore molecular formula = 6 x(CH₂O) = C₆H₁₂O₆

Molecular formula = C₆H₁₂O₆

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3 years ago
In the ground state, an atom of which element has two valence electrons?
Akimi4 [234]
I would say Ni so yeah thats ur answer


5 0
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Answer:

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What is meant by Critical temperatue?
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