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Veronika [31]
3 years ago
10

Why did Mendeleyev try to reorganize the periodic table?

Chemistry
1 answer:
Inga [223]3 years ago
3 0
Mendeleev’s chart allotted spaces for elements that were yet to be discovered. For some of these missing pieces, he predicted what their atomic masses and other chemical properties would be.
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How many grams is 0.125 moles of SiO2?
OleMash [197]
First, you need grams but you have moles.
Find out the total molar mass of SiO₂
Si = 28.085 g/mol Si
O₂ = 32 g/mol O₂
Add them together to get the molar mass
28.085 g/mol Si + 32 g/mol O₂ = 60.085 g/mol SiO₂
Multiply the molar mass of SiO₂ by the number of moles you have of the same substance:
60.085 g/mol SiO₂ × 0.125 mol SiO₂ =
7.51 grams SiO₂
8 0
3 years ago
Determine the molar mass of a 0.314-gram sample of gas having a volume of 1.6 l at 287 k and 0.92 atm. show your work.
Olenka [21]

As per Ideal gas equation, molar mass of the gas is 5.032 g/mo

We’ll begin by calculating the number of mole of the gas. This can be obtained as follow:

Volume (V) = 1.6 L

Temperature (T) = 287 K

Pressure (P) = 0.92 atm

Gas constant (R) = 0.0821 atm.L/Kmol

Number of mole (n) =?

According to Ideal gas equation , PV = nRT

0.92 × 1.6 = n × 0.0821 × 287

1.472 = n × 23.5627

Divide by 23.5627

n = 1.176 / 23.5627

n = 0.0624 mole

Finally, we shall determine the molar mass of the gas. This can be obtained as follow:

Mass of gas = 0.314 g

Number of mole = 0.0624 mole

Mole = \frac{mass}{molar mass}

0.0624 = \frac{0.314}{molar mass}

Cross multiply

0.0624 × molar mass of gas = 0.314

Divide by 0.0624

Molar mass of gas =  \frac{0.314}{0.0624}

Molar mass of gas = 5.032 g/mo

Therefore the Molar mass of gas is 5.032 g/mo

Learn more about  Ideal gas equation here:

brainly.com/question/3637553

#SPJ1

8 0
2 years ago
What is the process that keeps heat from being transferred between two substances is
elena55 [62]

Answer:

Conduction, Convection, and Radiation .......

5 0
2 years ago
Help plz:))) I’ll mark u brainliest ASAP 10 points
statuscvo [17]

Answer: I believe it’s the second one

(F)

Explanation:

8 0
3 years ago
sodium combines with water to produce a sodium hydroxide and hydrogen gas. which word equation respresents this violent reaction
Crank

Answer:

Na(s) + H₂O (l) → NaOH(aq) + H₂(g).

Explanation:

answer is this thank you I hope it helps you pls like

3 0
3 years ago
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