Advertisements
Advertisements
प्रश्न
Compute the difference in masses of 103 moles each of magnesium atoms and magnesium ions.
(Mass of an electron = 9.1×10–31 kg)
Advertisements
उत्तर
Mg+2ion = 10 electron
Mg atom = 12 electrons
Difference between Mg2+ and Mg = 2 moles of electrons
The difference between 103 moles of Mg and 103 moles of Mg2+ = 103 × 2 moles of electrons
Mass of 103 × 2 moles of electrons
= 2 × 103 × 6.022 × 1023 × 9.1 × 10−31 kg
= 1.096 × 10−3 kg
APPEARS IN
संबंधित प्रश्न
Calculate the molar mass of the following substance:
Ethyne, C2H2
Fill in the blank
Avogadro's number is equal to ______
Calculate the number of moles and number of molecules present in 1.4 g of ethylene gas. What is the volume occupied by the same amount of ethylene?
Which of the following would weight the least?
[Atomic masses : Ag = 108, N - 14, O = 16,C = 12]
A gas cylinder can hold 1 kg of hydrogen at room temperature and pressure.
(a) Find the number of moles of hydrogen present
(b) What weight of CO2can the cylinder hold under similar conditions of temperature and pressure? (H = 1 C = 12, O = 16)
(c) If the number of molecules of hydrogen in the cylinder is X, calculate the number of CO2 molecules in the cylinder with the same conditions of temperature and pressure.
(d) State the law that helped you to arrive at the above result.
Explain the term:
Molar volume
How many grams of HCl are present in 0.1 mole of it?
Calculate the mass of 0.1 mole of the following:
CaCl2
(Ca = 40, Na=23, Mg =24, S=32, C = 12, Cl = 35.5, O=16, H=1)
A student puts his signature with a graphite pencil. If the mass of carbon in the signature is 10-12 g, calculate the number of carbon atoms in the signature.
Cost of Sugar (C12H22 O11) is Rs 40 per kg; calculate its cost per mole.
