You are to convert 3.55 moles of
NaCl to formula units. Always remember that the
Avogadro’s number is 6.023*10^23 units per mole of a substance. Units could be
atoms, molecules or formula units. So, just multiply 3.55 moles
to <span>6.023*10^23 formula units per mole and you will get
2.138x10^24 formula units of NaCl.</span>
Answer:
what should i do? tell you how long its gonna dissolve for or something?
Explanation:
Answer:
Explanation:
Mint produced more than 130 billion pennies. Then, in 1982 the Mint introduced a penny that is 97.6 percent zinc and only 2.4 percent copper with a density of 7.2 g/mL. By comparison, the old pre-1982 copper pennies were 95 percent copper and 5 percent zinc with a density of 8.8 g/mL.
The number in Kg of oxygen that are present in the room is
403.1209 kg
<em><u>calculation</u></em>
mass=density x volume
density = 0.001429 g/ cm³
volume =775 cm x 1400 cm x 260 cm =2.821 x10^8 cm³
mass =0.001429 g/cm³ x( 2.8 x 10^8 cm³) =403120.9 grams
convert g to Kg
that is 1 kg = 1000 g
? kg =403120.9 g
by cross multiplication
=[(403120.9 g x 1 kg) /1000 g] =403.1209 kg
Answer:
Initial temperature = T₁ = -96.65 °C
Explanation:
Given data:
Initial volume = 4.5 L
Final temperature = 80°C (80+273 = 353 K)
Final volume = 9.0 L
Initial temperature = ?
Solution:
According to Charles law, The volume of given amount of a gas is directly proportional to its temperature at constant number of moles and pressure.
Mathematical expression:
V₁/T₁ = V₂/T₂
V₁ = Initial volume
T₁ = Initial temperature
V₂ = Final volume
T₂ = Final temperature
Now we will put the values in formula.
V₁/T₁ = V₂/T₂
T₁ = V₁ T₂/V₂
T₁ = 4.5 L × 353 K / 9.0 L
T₁ = 1588.5 L.K / 9.0 L
T₁ = 176.5 K
Kelvin to °C:
176.5 K - 273.15 = -96.65 °C