Elements and Compounds are pure substances.
The number of atoms of phosphorus in copper (II) phosphate [Cu3 (PO4)2] is determined by multiplying first 9.20 by 2 since there are two phosphorus atoms in the compound and multiplying again with Avogadro's number. The answer is 1.108 x 10^25 atoms.
Answer:
62.73g
Explanation:
Using the following formula;
Molarity = n/V
Where;
n = number of moles (mol)
V = volume (L)
From the information given below,
V = 230mL = 230/1000 = 0.230L
M = 3.21 M
3.21 = n/0.230
n = 3.21 × 0.230
n = 0.738 mol of KNO2
Molar mass of KNO2 = 39 + 14 + 16(2)
= 53 + 32
= 85g/mol
mole = mass/molar mass
0.738 mol = mass/85g/mol
Mass = 0.738 × 85
mass = 62.73g
3.88 atm is the pressure in atm, given that there are 1.45 moles of gas in the sample.
Explanation:
Given that:
Volume of the gas sample V = 8.77 litres
temperature of the gas sample T = 20 degrees OR 293.15 K
number of moles of the gas = 1.45
R (Gas constant) = 0.08021 L.atm/mole K
Pressure of the gas = ?
The equation for ideal gas will be used here to calculate the pressure of the gas:
PV = nRT
the equation is rewritten as:
P=
P =
P = 3.88 atm
1.45 moles of the gas at given conditions would have pressure of 3.88 atm.
Answer:
I think B no is correct orterwise Ano