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3 years ago

Determine the mass of 10.55 x 1029 molecules of cadmium chloride, CdCl,().

Chemistry

1 answer:

VashaNatasha [74]3 years ago

3 0

Answer:

Moles= 10.55*10^29ǜ.02*10^23

=1.75*10^6 moles

Moles= mass/molar mass

1.75*10^6=mass/ 183

Mass= 320*10^6 g

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Select all of the below statements that accurately describe the proper Lewis structure for CBr2F2.- The formal charge on each br

Yuri [45]

Answer:

There are 12 lone pairs of electrons on the molecule.

The formal charge on carbon is zero.

There are 4 covalent bonds within the molecule.

Explanation:

The formal charge(FC) can be calculated by the equation:

FC = V - N - B/2, where V is the number of the valence electrons of the neutral element, N is the number of non-bonding valence electrons, and B is the total of electrons shared in bond.

The Lewis structure is represented in the image below. F and Br have 7 valence electrons and C 4 valence electrons.

So, for C, FC = 4 - 0 - 8/2 = 0

For the both Br, FC = 7 - 6 - 2/1 = 0

For the both F, FC = 7 - 6 - 2/1 = 0

For the structure, we can see that there are 12 lone pairs of electrons on the molecule (3 in each Br and 3 in each F).

All the bonds are covalent because the atoms are sharing a pair of electrons, so there are 4 covalent bonds within the molecule.

6 0

3 years ago

1.Complete the balanced neutralization equation for the reaction below:

Alexxx [7]

1. $H_{2}$ S $O_{4}$ + Sr(OH) $_{2}$ ⇒ SrSO4 + 2 H2O is the balanced reaction.

2. 0.034 liters of KI will be required completely react with 2.43 g of Cu(NO3)2.

3. 0.55 liters is the volume in L of a 0.724 M Nal solution contains0.405 mol of NaI.

4. 33.3 ml many mL of 0.300 M NaF would be required to make a 0.0400 M solution of NaF when diluted to 250.0 mL with water

Explanation:

Balance chemical reaction of neutralization:

1. $H_{2}$ S $O_{4}$ + Sr(OH) $_{2}$ ⇒ SrSO4 + 2 H2O

2. Data given:

balance chemical reaction:

2Cu(NO₃)₂(aq) + 4KI(aq) → 2CuI(aq) + I₂(s) + 4KNO₃(aq)

molarity of KI = 0.209 M

mass of Cu(NO₃)₂ = 2.43 grams

number of moles of Cu(NO₃)₂ will be calculated as:

number of moles = $\frac{mass}{atomic mass of 1 mole}$

atomic mass of Cu(NO₃)₂ = 187.56 grams/mole

putting the values in the equation,

number of moles= $\frac{2.43}{187.56}$

= 0.0129 moles

2 moles of Cu(NO₃)₂ will react with 4 moles of KI

0.0129 moles will react with x moles of KI

$\frac{4}{2}$ = $\frac{x}{0.0129}$

x = 0.0258

atomic mass of KI = 166.00 grams/mole

mass = 166.00 x 0.0258

= 4.28 grams or ml is the final volume of KI

so molarity = $\frac{number of moles}{volume in litres}$

so molarity of KI is 0.0258 M, volume is 1 litre.

Using the formula

Minitial x Vinitial = M final Vfinal

V initial = $\frac{M final Vfinal}{Minitial}$

= $\frac{4.28 X 0.209}{0.0258}$

= 34.67 ml 0.034 liters of KI will be required.

3) Data given:

molarity of NaI = 0.724

number of moles of NaI =?

Volume in litres =?

formula used:

molarity = $\frac{number of moles}{volume in liters}$

volume in litres = $\frac{0.405}{0.724}$

= 0.55 liters is the volume

4) Data given:

Initial molarity = 0.3 M

initial volume = ?

final molarity = 0.04 M

final volume diluted by = 250 ml

formula used:

M initial X Vinitial = Mfinal X V final

putting the values in the equation:

Vinitial = $\frac{0.04 X 250}{0.3}$

= 33.3 ml of 0.3 M solution will be required.

5 0

4 years ago

What is 5 ounces in milliliters?

SIZIF [17.4K]

1 ounces ----------- 29.5735 mL
5 ounces ----------- ??

5 x 29.5735 / 1 => 147.868 mL

hope this helps!

6 0

3 years ago

An object starts at position 12 on a horizontal line with a reference point of o. What is the position of the object if it moves

eimsori [14]

Answer:

-2

Explanation:

Consider object is starting 12 units right from the reference point which is 0.

Assign the right direction positive sign.

when object is moving 14 units on left direction the position of object will be two units to the left side of reference point.

Assign the left direction negative sign position will be -2.

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3 years ago

What does the most accurate clock tell us

Murrr4er [49]

It tell us the most accurate time u can get out of a clock

6 0

4 years ago

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