Chemistry For Class IX (New Book ) - Chapter No. 5 - Physical States Of Matter - Numericals

GO TO INDEX

Chapter No.5- Physical States Of Matter
Numericals
Text Book Exercise

SECTION- D: NUMERICALS

1) Convert the following units:
(a) 100 °C to K
(b) 150 °C to K
(c) 780 K to °C
(d) 170 K to °C

Solution
a) 100 °C to K
Data:

• Temperature in Celsius (C) = 100 °C
• Temperature in Kelvin (K) = ?

Formula:

K = 273 + °C

Calculation:

K = 273 + 100 = 373 K Ans.

(b) 150 °C to K
Data:

• Temperature in Celsius (C) = 150 °C
• Temperature in Kelvin (K) = ?

Formula:

K = 273 + °C

Calculation:

K = 273 + 150 = 423 K Ans.

(c) 780 K to °C
Data:

• Temperature in Kelvin (K) = 780 K
• Temperature in Celsius (C) = ?

Formula:

°C = K - 273

Calculation:

°C = 780 - 273 = 507 °C Ans.

(d) 170 K to °C
Data:

• Temperature in Kelvin (K) = 170 K
• Temperature in Celsius (C) = ?

Formula:

°C = K - 273

Calculation:

°C = 170 - 273 = - 103 °C Ans.

More Numericals
Examples From Text Book

Examples 5.2: The 700 cm³ of a gas is enclosed in a container under a pressure of 650 mm of Hg. If the volume is reduced to 350 cm³, what will be the pressure then?
Solution:
Data:

• V₁ = 700 cm³
• P₁ = 650 mm
• V₂ = 350 cm³
• P₂ = ?

Formula:

P₁ V₁ = P₂ V₂

Examples 5.4: A sample of Hydrogen gas has a volume of 350 cm³ at 40 °C. If gas is allowed to expand up to 700 m³ at constant pressure. Find out its final temperature?
Solution:
Data:

• T₁ = 40 °C = 40+273 K = 313 K
• V₁= 350 cm³
• V₂= 700 cm³
• T₂ = ?