Answer:
Decomposition of potassium chlorate yields potassium chloride and oxygen as:
2KClO
3
→2KCl+3O
2
Thus 2 moles of potassium chlorate yields 3 moles of oxygen gas.
2 moles of potassium chlorate =2×122.5=245g of potassium chlorate
At STP, the volume occupied by 1 mol of gas =22.4 dm
3
the volume occupied by three moles of a gas =3×22.4=67.2dm
3
Therefore, 245g of potassium chlorate yields 67.2dm
3
of oxygen gas
To liberate 6.72 dm
3
oxygen amount of potassium chlorate required is
=
67.2
245
×6.72=24.5g
Hence, 24.5 g of potassium chlorate required to liberate 6.72 dm
3
of oxygen at STP
Answer:
The density of a substance that has a mass of 75 g and a volume of 35 mL is 2.14 
Explanation:
Density is a characteristic property of a substance that relates to the amount of mass it has per unit volume. In other words, density is the property that matter, whether solid, liquid or gas, has to compress into a given space (it measures the amount of mass in a given volume of a substance). It is calculated as the quotient between the mass of a body and the volume it occupies:
In this case, you know:
Replacing:
Solving:
<u><em>The density of a substance that has a mass of 75 g and a volume of 35 mL is 2.14 </em></u><u><em></em></u>
Answer:
A magnetic field is a vector field that describes the magnetic influence on moving electric charges, electric currents, and magnetic materials. ... Magnetic fields are produced by moving electric charges and the intrinsic magnetic moments of elementary particles associated with a fundamental quantum property, their spin.
Answer:
0.43×10²³ atoms
Explanation:
Given data:
Mass of LiBrO₂ = 4.28 g
Number of atoms of oxygen = ?
Solution:
Number of moles = mass/molar mass
Number of moles = 4.28 g/ 118.84 g/mol
Number of moles = 0.036 mol
We can see 1 mole of LiBrO₂ contain 2 mole of oxygen atm.
0.036 mol × 2 = 0.072 mol
1 mole contain 6.022×10²³ atoms
0.072 mol × 6.022×10²³ atoms / 1mol
0.43×10²³ atoms
