3 years ago

17. Elements in the periodic table are arranged according to their.

Chemistry

1 answer:

iren2701 [21]3 years ago

7 0

In the modern periodic table the elements are arranged in order of increasing atomic number.

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Does the density of an object depend on its size? Explain?.

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No, the density of an object does not depend on its size.

A piece of glass with a volume of 10 cm³ may have a mass of 27 g. Its density is

D = m/V = 27 g/10 cm³ = 2.7 g/cm³

A piece of the same type of glass with a volume of 20 cm³ will have a mass

of 54 g. Its density is

D = m/V = 54 g/20 cm³ = 2.7 g/cm³

Thus, density does not change with the size of an object. Density is an intensive property.

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. What elements are present in the following chemical formula? KNO3

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The answer would be potassium nitrate.

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3 years ago

Find the heat produced from an 8.00 L cylinder of propane gas under 5.00 atm at 25.0 oC, if one mole of propane can produce 2220

Andrei [34K]

Answer: 3597 kJ of heat

Explanation:

According to ideal gas equation:

$PV=nRT$

P = pressure of gas = 5.00 atm

V = Volume of gas = 8.00 L

n = number of moles = ?

R = gas constant = $0.0821Latm/Kmol$

T =temperature = $25.0^0C=(25.0+273)K=298K$

$n=\frac{PV}{RT}$

$n=\frac{5.00atm\times 8.00L}{0.0821 L atm/K mol\times 298K}=1.63moles$

As it is given :

1 mole of propane produces = 2220 kJ of heat

Thus 1.63 moles of propane produces = $\frac{2200}{1}\times 1.63=3597kJ$

Thus 3597 kJ of heat is produced

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Read 2 more answers

Which atoms have the same number of neutrons?

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2) H-2 and He-3 N(n)=1

4) H-3 and He-4 N(n)=2

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4 years ago

17. Elements in the periodic table are arranged according to their.​

17. Elements in the periodic table are arranged according to their.