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3 years ago

If you start with 10ml of 0.75 m cu(no3)2 how much cu (s) in grams should be recovered in step #7

1 answer:

4 0

<span>0.48 grams. Not a well worded question since it's assuming I know the reactions. But I'll assume that since there's just 1 atom of copper per molecule of Cu(NO3)2, that the reaction will result in 1 atom of copper per molecule of Cu(NO3)2 used. With that in mind, we will have 0.010 l * 0.75 mol/l = 0.0075 moles of copper produced. To convert the amount in moles, multiply by the atomic weight of copper, which is 63.546 g/mol. So 0.0075 mol * 63.546 g/mol = 0.476595 g. Round the results to 2 significant figures, giving 0.48 grams.</span>

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Is C5H10 ionic or covalent?

brilliants [131]

Covalent because it is 5 and 10 so there even numbers I think

7 0

3 years ago

Read 2 more answers

A student has 2.99 g of Potassium Permaganate. How many mL of a .532 M solution can the student make?

Anika [276]

Answer:

Explanation:

you must be know the formula of potassium permaganate is KMnO₄

now you have already in question 2 things ,

1. the molarity of solution = 0.532 M

2. the mass of KMnO₄ = 2.99 g

the molarity law is M = moles of solute / volume (L)

so use this equation to calculate the volume in liter and convert the result to milliliter.

( if the mass unit is gram (g) = volume must be litter (L) and if the mass unit is milligram = volume must be milliliter (ml) )

** first you must use this equation to calculate how many moles do you have in KMnO₄

number of moles = mass (g) / molecular weight "MW" (g/mole )

now you have 2.99 g ( Mentioned in Question )

and you can calculate MW if you now the Chemical formula

so we have KMnO₄

Mw for KMnO₄ = 39 + 55 + 4x16 = 158 g/mole

**( K=39 , Mn=55 , O= 16 )

so number of moles = 2.99 / 158 = 0.018 = 0.02 moles

and if you go back to the molarity law :

Molarity = moles of solute / volume (L)

so 0.532 = 0.02 / volume (L)

Volume (L) = 0.532 x 0.02 = 0.01064 L

convert to ml = 0.01064 x 1000 = 10.64 ml

Good Luck

4 0

3 years ago

Fe2o3 + 3C —> 2Fe +3CO

Anika [276]

Answer:

1. iron(III) oxide

2. 8

3. 8

Explanation:

Know the naming rules

Reactants on left side products on right side

3 0

4 years ago

Use the Rydberg equation to calculate the wavelength (in nm) of the photon emitted when a hydrogen atom undergoes a transition f

natka813 [3]

Answer:

The answer is 434nm

Explanation:

The Rydberg equation is an empirical relationship expressed by Balmer and Rydberg which is stated as:

1/λ = $R_{H} (\frac{1}{n_{f} ^{2} }-\frac{1}{n_{i} ^{2} } )$ .............................. (1)

where λ is the wavelength, $R_{H}$ is the Rydberg constant equal to $1.097 x 10^{7}m^{-1}$ , n is the transition level number, the subscript f and i are the final and initial levels respectively. Therefore for final transition n = 2 and for initial transition n = 5.