Answer:
1. Volume as STP = 755 L
2. Outside temperature = 255 K
3. Percentage yield = 70.5%
Explanation:
1. At STP, pressure = 101.3 kpa, temperature = 0°C or 273.15 K
Using the general gas equation :
P1V1/T1 = P2V2/T2
P1 = 620 kpa
V1 = 140 L
T1 = 37°C or (273.15 + 37) K = 310.15 K
P2 = 101.3 kpa
V2 = ?
T2 = 273.15 K
V2 = P1V1T2/P2T1
V2 = 620 × 140 × 273.15 / 101.3 × 310.15
V2 = 755 L
2. Using Charles' gas law:
V1/T1 = V2/T2
V1 = 2.5 L
T1 = 290 K
V2 = 2.2 L
T2 = ?
T2 = V2T1/VI
T2 = 2.2 × 290 / 2.5
T2 = 255 K
3. Equation of reaction : 2 Al + 3 CuSO4 ---> Al2 (SO4)3 + 3 Cu
From equation of the reaction, 2 moles of Al produces 3 moles of Cu
Molar mass of Al = 27 g; Molar mass of Cu = 63.5 g
2 moles of Al = 2 × 27 g = 54 g; 3 moles of Cu = 3× 63.5 = 190.5 g
54 g of Al produces 190.5 g of Cu
1.87 g of Al will produce 190.5/54 × 1.87 g of Cu = 6.60 g of Cu
Percentage yield = actual yield /theoretical yield × 100%
Percentage yield = 4.65/6.60 × 100%
Percentage yield = 70.5%
Answer:
A.evidence to the existence of life
Explanation:
Answer:
The specific heat capacity of the metal is 0.268 J/g°C
Explanation:
Step 1: Data given
Mass of the metal = 151.5 grams
The temperature of the metal = 75.0 °C
Temperature of water = 15.1 °C
The temperature of the water rises to 18.7°C.
The specific heat capacity of water is 4.18 J/°C*g
Step 2: Calculate the specific heat capacity of the metal
heat lost = heat gained
Q = m*c*ΔT
Qmetal = - Qwater
m(metal) * c(metal) * ΔT(metal) = m(water) * c(water) * ΔT(water)
⇒ mass of the metal = 151.5 grams
⇒ c(metal) = TO BE DETERMINED
⇒ΔT( metal) = T2 - T1 = 18.7 °C - 75.0 °C = -56.3 °C
⇒ mass of the water = 151.5 grams
⇒ c(water) = 4.184 J/g°C
⇒ ΔT(water) = 18.7° - 15.1 = 3.6 °C
151.5g * c(metal) * -56.3°C = 151.5g * 4.184 J/g°C * 3.6 °C
c(metal) = 0.268 J/g°C
The specific heat capacity of the metal is 0.268 J/g°C
Velocity is explained as the *speed and *direction something might move. Speed means moving and Direction means a certain way (not stationary.)
Hope this helps!
Answer: <em>When you take the top off of a bottle of soda, the pressure inside the bottle decreases and goes to the same pressure as the atmosphere. When that happens the carbon dioxide inside is no longer forced to be a liquid and turns back into a gas, causing the bubbles that we're so familiar with.</em>
Explanation:
However, producing foaming carbon dioxide gas by shaking a bottle of soda water is a physical change, while producing foaming carbon dioxide gas by combining baking soda and vinegar is a chemical change. ... Because no chemical bonds are broken and no new molecules are formed, this is a physical change in the system.
