Its <span>234or238 hope dis helped</span>
Answer:
An element is a substance that is made up of the same kind of atoms and
cannot be broken down into simpler substances by any known chemical means
examples of element are iron boron carbon helium calcium hydrogen etc
Answer:
Barb tested the streak and luster.
Explanation:
Pls mark brainliest
Answer:
22572J
Explanation:
a) The following values have been given:
Mass of water = 180.0g
Initial temperature = 10°C
Final temperature = 40°C
molar heat capacity for water = 75.3J/Kmol
To calculate the specific heat capacity of water (c), we divide the molar heat capacity by molar mass of water (18g/mol)
That is; 75.3/18
= 4.183 Jg/K
b) The enthalpy change denoted by ∆H is the value we are trying to find.
c) To find enthalpy change (∆H), we use the formula:
∆H = m × c × ∆T
Where; m= mass
c= specific heat capacity
∆T= change in temperature =
(final temp - initial temp)
∆H = m × c × ∆T
∆H = 180 × 4.18 × (40-10)
∆H = 180 × 4.18 × 30
∆H = 22572J
Answer:
Partia pressure N₂ → 0.975 atm
Explanation:
Let's analyse the moles fractions:
N₂ → 0.25
O₂ → 0.65
He → 0.1
Partial pressure / Total pressure = Mole fraction
Partial pressure N₂ / 3.9 atm = Mole fraction N₂
Partial pressure N₂ / 3.9 atm = 0.25
Partial pressure N₂ = 3.9 atm . 0.25 → 0.975 atm
