Answer:
3566.4 days
Explanation:
The reaction follows a first-order
Rate = kC = change in concentration/time
k = 0.2 day^-1
C = 0.14 mg.L^-1
Co = 100 mg.L^-1
0.2×0.14 = 100 - 0.14/t
t = 99.86/0.028 = 3566.4 days
sodium carbonate is a good looking compund available in physics laboratory so that we can microscope the rock cells
Answer:
Explanation:
In creating this list, one will have to start from the atom (which is the smallest in the list) to the giant polymer (which is the largest in the group). The arrangement below will also be based on there molecular weight.
oxygen molecule (this is the first because it is an atom)
water molecule (this is lighter in weight than carbon dioxide)
carbon dioxide
amino acid molecule (most amino acids have a lesser molecular weight than glucose)
glucose (has a molecular weight of 180.156 g/mol)
protein molecule (several proteins have a lesser molecular weight than starch)
starch molecule (has a molecular weight of 359.33 g/mol)
Let's assume that CH₄ has ideal gas behavior.
Then we can use ideal gas formula,
PV = nRT
Where, P is the pressure of the gas (Pa), V is the volume of the gas (m³), n is the number of moles of gas (mol), R is the universal gas constant ( 8.314 J mol⁻¹ K⁻¹) and T is temperature in Kelvin.
P = 1 atm = 101325 Pa
V = 1.50 L = 1.50 x 10⁻³ m³
n = ?
R = 8.314 J mol⁻¹ K⁻¹
T = 0 °C = 273 K
By substitution,
101325 Pa x 1.50 x 10⁻³ m³ = n x 8.314 J mol⁻¹ K⁻¹ x 273 K
n = 0.0669 mol
Hence, moles of CH₄ = 0.0669 mol
Moles = mass / molar mass
Molar mass of CH₄ = 16 g mol⁻¹
Mass of CH₄ = moles x molar mass
= 0.0669 mol x 16 g mol⁻¹
= 1.0704 g
Hence, mass of CH₄ in 1.50 L at STP is 1.0704 g