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3 years ago

15

which of the following is not a valid conversion factor? A.) 60seconds/1minute B.) 12hours/1day C.) 1dozen/12 cookies D.) 1yard/

3feet

1 answer:

olga2289 [7]3 years ago

6 0

I think the answer is b

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The interphase usually lasts the longest

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How many moles of Na are needed to produce 4 moles of NaCl in the reaction below?

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4 moles of Na are needed.

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2 years ago

Mg + 2H20 + Mg(OH)2 + H2 + 353kJ

mixer [17]

Answer:

$m_{H_2O}=8.9g$

Explanation:

Hello,

Based on the given reaction, since magnesium and water are in a 1:2 molar ratio at the reactants, we must apply the following stoichiometric factors to compute the complete reaction of the 6.0 g of magnesium:

$m_{H_2O}=6.0gMg*\frac{1molMg}{24.305 gMg}*\frac{2molH_2O}{1molMg} *\frac{18gH_2O}{1molH_2O} \\\\m_{H_2O}=8.9g$

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7 0

3 years ago

A student uses visible spectrophotometry to determine the concentration of CoCl2(aq) in a sample solution. First the student pre

gladu [14]

Answer:

A

Explanation:

2.60 g of CoCl2 was dissolved in water to make 100 mL of solution.

Number of moles of CoCl2 dissolved = mass/molar mass

= 2.60/130

= 0.02 mole

Molar concentration of solutions = number of moles/volume (dm3)

= 0.02/0.1

= 0.200 M

Hence, the molar concentration of thesolution is 0.200 molar.

Correct option = A

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3 years ago

What is true when a reaction has reached equilibrium?

Evgesh-ka [11]

The answer is the last option

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