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KATRIN_1 [288]
3 years ago
13

লবণ ও বালুর মিশ্রন পরীক্ষা​

Chemistry
1 answer:
bija089 [108]3 years ago
3 0

Answer:

cause it has more

space between molecules.

O C. Ice has a higher density than li

Explanation:

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How many grams of Al2O3are present in 7.1 x 10^22 molecules of Al2O3?
Alexus [3.1K]

Answer:

13.4g

Explanation:

we know that:

1 mole = 6.02 × 10²³ atoms

make the unknown number of moles = x

x = 7.1 × 10²² atoms

putting them both together:

1 mole = 6.02 × 10²³ atoms

x = 7.1 × 10²² atoms

Cross multiply:

6.02 × 10²³ x = 7.1 × 10²²

divide both sides by 6.02 × 10²³

x =  \frac{7.1  \times  10²² }{  6.02 × 10²³}

x =  \frac{71}{602}

we now have the number of moles of Al₂CO₃

to calculate the grams (mass):

moles =  \frac{mass}{relative \: formula \: mass}

mass = moles \:  \times  \: relative \: formula \: mass

add up all of the atomic masses of Al₂CO₃ to calculate relative formula mass:

(27 × 2) + 12 + (16 × 3) = 114

the grams (mass) of Al₂CO₃:

\frac{71}{602}  \times 114 = 13.4g

5 0
3 years ago
The three states of matter are solid, liquid, and gas. true or false
maria [59]
That is True XD
Hope that  helps :D
3 0
3 years ago
Which type of community will have more competition than cooperation?
Vedmedyk [2.9K]

Answer:

a 10,00 year-old coral reef ecosystem

6 0
2 years ago
How many grams of kbr must be dissolved to make 25.0 ml of a solution that has a molarity of 0.85 m?
lyudmila [28]
Molarity is defined as the number of moles of solute in 1 L of solution 
molarity of solution to be prepared is 0.85 M
this means that there should be 0.85 mol of KBr in 1 L of solution 
if 1 L contains - 0.85 mol
then 25.0 mL should contain - 0.85 mol / 1000 mL x 25.0 mL = 0.0213 mol 
mass of KBr - 0.0213 mol x 119 g/mol = 2.53 g
mass of KBr that should be dissolved in 25.0 mL is 2.53 g

4 0
3 years ago
Arenediazoniums can undergo electrophilic aromatic substitutions with a wide variety of activated aromatic compounds to yield ne
mel-nik [20]
B false
I did this last year and it’s false
4 0
3 years ago
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