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Tom [10]
3 years ago
15

How many moles are in 9.8 grams of calcium?

Chemistry
2 answers:
seraphim [82]3 years ago
6 0

Answer: 0.24 moles

Explanation:

kondor19780726 [428]3 years ago
4 0
<span>when the number of moles Ca = mass of Ca / molar mass of Ca.

and we can get the molar mass of Ca, it is = 40 g/mol

and we have already the mass of Ca (given) = 9.8 g

so, by substitution: the moles Ca = 9.8 g / 40 g/mol

                                                       = 0.245 moles</span>
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How is electronegativity related to covalent bonding?
Vinvika [58]
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4 0
3 years ago
Please help me with this science
MAVERICK [17]

The answer is no. <u>5 grams are equal to 5 milligrams</u>.

"Milli" means million so a <u>milli</u>gram is one-<u>milli</u>onth of a gram.

6 0
3 years ago
You wish to make a 0.285 M hydroiodic acid solution from a stock solution of 12.0 M hydroiodic acid. How much concentrated acid
Inessa05 [86]

The amount, in mL, of the concentrated acid required, would be 1.1875 mL

<h3>Dilution</h3>

From the dilution equation:

m1v1=m2v2 where m1 and m2 = molarity before and after dilution, and v1 and v2 = volume before and after dilution.

m2 = 0.285M, m1 = 12.0M v2 = 50.0 mL

v1 = m2v2/m1 = 0.285x50/12 = 1.1875 mL

Thus, 1.1875 mL of the acid would be taken and diluted with water up to the 50 mL mark.

More on dilution can be found here: brainly.com/question/13949222

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4 0
2 years ago
In each reaction box, place the best reagent from the list below. draw the intermediate compound.
Fynjy0 [20]

Answer:

Reagent A: PBr₃

Reagent B: Mg in Et₂O.

Explanation:

Hello,

In this case, your facing a problem in which a carboxylic acid is produced starting by an alcohol. More specifically, cyclopentanol must react with phosphorous tribromide in order to yield bromocyclopentane which is more likely to produce a carboxylic acid, therefore, reagent A is PBr₃.

On the other hand, by means of the production of the specified product, bromocyclopentane must react with carbon dioxide and magnesium in diethyl ether in acidic media to promote the production of the cyclopentanoic acid via the grignard reaction (substitution of the bromine by the carboxyle group), therefore, reagent B is Mg in Et₂O.

Best regards.

8 0
3 years ago
What units do we use to measure mass?
MA_775_DIABLO [31]

Answer:

We mostly use Kilograms and grams to measure mass =)

Explanation:

4 0
3 years ago
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