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2 years ago

Convert 56.78 grams of Ca(OH)_2 to moles

Chemistry

1 answer:

ki77a [65]2 years ago

6 0

Answer: 0.77 mole

Explanation:

Atomic mass of Ca = 40g/mol

Atomic mass of O = 16g/mol

Atomic mass of H = 1

Therefore,

1 mole of Ca(OH)_2 contains

40+[16+1]2

= 40+34

=74g/mole

Hence,

1 mole of Ca(OH)_2 = 74g

Let x mole of Ca(OH)_2 = 56. 78

x = 56.78/74

x = 0.77 mole

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Which one violates the octet rule?

Andrews [41]

Answer:

F1+ is the one that violates the octet rule

Explanation:

F1+ does not end up having 8 electrons in its valence shell, and there for violates the octet rule, for an atom to comply with the octet rule its charge must reflect the number of electrons it needs to gain or lose to make an octet, but F1+'s charge does not reflect the number of electrons it needs to be stable or have an electron configuration of a noble gas

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3 years ago

Name the following compound. Group of answer choices 2-methyl-4-pentyne 4-methyl-3-propyl-1-pentyne 3-isopropyl-1-hexyne 1-nonyn

Fynjy0 [20]

The question is incomplete, the complete question is shown in the image attached

Answer:

3-isopropyl-1-hexyne

Explanation:

Organic compounds can be named from the structure of the compound. The name reveals the arrangement of atoms and bonds in the molecule.

If we look at the compound in the question, we will notice that the parent chain contains six carbon atoms, the triple bond is located at position 1 and the isopropyl substituent is attached to carbon 3.

Hence the proper name of the compound becomes, 3-isopropyl-1-hexyne.

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3 years ago

What is the concentration created when 380.0g of Pb(NO3)2 is added to 330.0 mL of solution?

Juliette [100K]

The concentration of lead nitrate is 3.48 M.

Explanation:

The molarity can be found by dividing moles of sucrose by its volume in litres. We can find the number of moles of sucrose by dividing the given mass by its molar mass. Now we can find the moles as,

Here mass of Pb(NO₃)₂ is 380 g

Molar mass of Pb(NO₃)₂ is 331.2 g/mol

Number of moles = $$\frac{given mass}{molar mass}$

= $$ \frac{380 g }{331.2 g/mol}$

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2 years ago

You are going to standardize your sodium hydroxide by titrating with potassium hydrogen phthalate. As an example, you dissolve 0

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Answer:

0.13 M

Explanation:

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Where;

C= concentration

V= volume in dm^3

n= number of moles

C= n/V = 1.65 × 10^-3 moles × 1000/250 = 6.6 × 10^-3 M

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We have that only 12.44 ml of NaOH reacted

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At the equivalence point, the KHP solution turned light pink.

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3 years ago

Balance 6Sb +6Cl2– 6SbCl3

labwork [276]

Answer:

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If there is a bracket in the chemical formula

For example $3Ca_3 (P_1 O_4 )_2$ we multiply coefficient $\times$ subscript $\times$ number outside the bracket.......... to find the number of atoms

(Please note: 3 is the coefficient, and if there is no number given then 1 will be the coefficient )

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(Unbalanced)

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2 - Cl - 3

So we have on the product side odd number of Cl to convert to even number, multiply $SbCl_3$ by 2

The equation changes to

$1Sb +1Cl_2> 2SbCl_3$

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1 - Sb - 2

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2 - Sb - 2

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Balanced.

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2 years ago