Advertisements
Advertisements
प्रश्न
The visible universe is estimated to contain 1022 stars. How many moles of stars are present in the visible universe?
Advertisements
उत्तर
1 mole of stars = 6.022 × 1023 stars
Number of moles of stars = `10^22/(6.023 xx 10^22)`
= 0.0166 moles
APPEARS IN
संबंधित प्रश्न
A gas cylinder can hold 1 kg of hydrogen at room temperature and pressure
1) Find the number of moles of hydrogen present.
2) What weight of CO2 can the cylinder hold under similar conditions of temperature and pressure? (H = 1, C = 12, O = 16)
3) If the number of molecules of hydrogen in the cylinder is X, calculate the number of CO2 molecules in the cylinder under the same conditions of temperature and pressure.
4) State the law that helped you to arrive at the above result.
Fill in the following blanks :
64 g of oxygen gas contains ................ moles of oxygen atoms.
How many moles are there in 34.5 g of sodium ? (Atomic mass of Na = 23 u)
Calculate the mass in grams of 0.17 mole of hydrogen sulphide, H2S. (Atomic masses : H = 1 u, S = 32 u)
Explain the term:
Molar volume
Calculate the number of oxygen atoms in 0.10 mole of Na2CO3 . 10H2O.
Calculate the number of moles in 7g of nitrogen.
1 mole of any substance contains ______ molecules.
Calculate the number of moles in 1.51 × 1023 molecules of NH4Cl.
Calcium chloride when dissolved in water dissociates into its ions according to the following equation.
\[\ce{CaCl2} (aq) → {Ca^{2+} (aq) + 2{Cl}- (aq)}\]
Calculate the number of ions obtained from CaCl2 when 222 g of it is dissolved in water.
