Advertisements
Advertisements
Question
Four grams of caustic soda contains ______.
Options
6.02 x 1023 atoms of it
4 g atom of sodium
6.02 x 1022 molecules
4 moles of NaOH
Solution
Four grams of caustic soda contains 6.02 x 1022 molecules.
Explanation:
40 g of NaOH contains 6.023 x 1023 molecules
So, 4 g of NaOH contains = `4/40 xx 6.02 xx 10^23`
= `1/10 xx 6.02 xx 10^23`
= 6.02 x 1022 molecules
APPEARS IN
RELATED QUESTIONS
What is the mass of 0.5 mole of water molecules?
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.
What is meant by ‘a mole of carbon atoms’ ?
Explain the term : Gram mole
Calculate the weight of one molecule of oxygen .
[Avogadro's number = 6 x 1023, O = 16 ]
A student puts his signature with graphite pencil. If the mass of carbon in the signature is 10-12 g. Calculate the number of carbon atoms in the signature.
Define or explain the term:
Relative atomic mass
Calculate the mass of 0.1 mole of the following:
Na2SO4.10H2O
(Ca = 40, Na = 23, Mg = 24, S = 32, C = 12, Cl = 35.5, O = 16, H = 1)
Cost of Sugar (C12H22 O11) is Rs 40 per kg; calculate its cost per mole.
Cinnabar (HgS) is a prominent ore of mercury. How many grams of mercury are present in 225 g of pure HgS? Molar mass of Hg and S are 200.6 g mol–1 and 32 g mol–1 respectively.
