3 years ago

What Resources do organisms compete over?

Chemistry

1 answer:

Alex787 [66]3 years ago

7 0

Siekejekekekskkensndjdjd

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For which compound does 0.256 mole weigh 12.8 g?

mylen [45]

Number of moles = $\frac{mass (g)}{Molar mass}$
so to calculate molar mass (Molecular weight of compound):
Molecular weight = $\frac{mass (g)}{number of moles}$
= $\frac{12.8 g}{0.256 mole}$ = 50 g / mole
Now we calculate molecular weight of each compound in choices:
a) C₂H₄O = 44
b) CO₂ = 44
c) CH₃Cl = 50.4 ALMOST 50 so this is the correct answer
d) C₂H₆ = 30

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3 years ago

Why don't elements in a group have consicutive atomic numbers?

slamgirl [31]

Answer:

Periods have consecutive atomic number as they are in a row and groups are vertical meaning they are in a column and groups have similar properties

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3 years ago

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Answer:

Fe + Cu(NO3)2 →

Explanation:

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What can group numbers on the periodic table help you determine?

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Http://www.chem4kids.com/files/elem_pertable.html this should help.

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If an experiment with 10.2 g barium chloride produced 14.5 g silver chloride, calculate thr experimental mole ratio of silver ch

Leni [432]

The experimental mole ratio of silver chloride to barium chloride is calculated as below

fin the mole of each compound

mole= mass/molar mass
moles of AgCl = 14.5g/142.5 g/mol = 0.102 moles of AgCl
moles of BaCl2 = 10.2 g/208 g/mol = 0.049 moles of BaCl2

find the mole ratio by dividing each mole with the smallest mole(0.049)

AgCl= 0.102/0.049 =2
BaCl2 = 0.049/0.049 =1
therefore the mole ratio AgCl to BaCl2 is 2 :1

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