Aluminum carbonate (s)- aluminum oxide(s) -carbon dioxide (g)

What volume of 1.25 M solution is needed to make 250 mL of 0.75 M solution?

zysi [14]

Answer:

V1= 150ml

Explanation:

C1= 1.25, V1=?, C2= 0.75, V2= 250ml

Applying dilution formula

C1V1= C2V2

V1= (0.75×250)/1.25 = 150ml

6 0

3 years ago

What is the total number of elements in group 17 that are gases at room temperature and standard pressure?

White raven [17]

Answer:

Only to elements are gases at room temperature and standard pressure.

Fluorine and chlorine.

Explanation:

The group 17 is called halogen.

There are five elements in halogen group.

All halogens required one electrons to complete the octet and to get the noble gas electronic configuration.

All halogen elements have seven valance electrons.

Halogen elements:

Fluorine, chlorine, Bromine, iodine and astatine

Fluorine is gas at room temperature which s 25°C and standard pressure which is 1 atm.

It is present in the from of F₂.

Chlorine is also gas at room temperature and standard pressure.

It is present in the from of Cl₂.

The bromine is liquid under these condition.

Iodine and astatine are solids.

As we move down the group their melting and boiling points increases.

4 0

3 years ago

write a balanced chemical reaction when heated aluminium metal react with solid copper oxide produce copper metal and aluminium

prohojiy [21]

Answer:

Explanation:

So let's break this chemical equation down into 2 parts - Reactants and Products

Reactants = Al + CuO

Products = Cu + Al2O3

So the Chemical Reaction will be

Al + CuO ==> Cu + Al2O3

So the balanced equation will be,

2Al + 3CuO ==> 3Cu + Al2O3

PLS mark as brainliest

3 0

3 years ago

A solution is made by dissolving 100. g of cobalt(III)chloride in 250. g of water. to make a solution that has a density of 1.25

Mariulka [41]

Answer:

Option A) (I) 2.42 m (II) 2.16 M

Explanation:

Let's determine some information.

Solute = CoCl₃ (molar mass = 165.29 g/m); mass of 100 g

Solvent = Water, mass of 250 g

Solution mass = mass of CoCl₃ + mass of water

250 g + 100 g = 350 g of solution

If we want to reach molarity (mol/L), let's determine solution volume with density:

Solution density = solution mass / solution volume

1.25 g/mL = 350 g / solution volume

Solution volume = 350 g / 1.25 g/mL = 280 mL

Let's convert the volume to L → 280 mL = 0.280L

Let's convert the mass of solute to moles = 100 g / 165.29 g/m →0.605 mol

Mol/L = 0.605 moles / 0.280 L = 2.16 M

Now let's calculate molalilty (mol/kg of solvet)

We must convert solvent mass to kg → 250g = 0.250 kg

Then, 0.605 moles / 0.250 kg =2.42 m

8 0

4 years ago

What is the chemical formula for the binary compound composed of au3+ and i- ions?

Step2247 [10]

AuI3, or Gold Iodide.

Hope this helps! :)

8 0

3 years ago