Question

1. calculate the mass of one co2 molecule
2. calculate the number of molecules present in 1ml of oxygen at NTP
3.calculate the number of molecules present in 56ml of oxygen at NTP
4.calculate the number of moles in 3.01 × 10^22 molecules of co2
5.calculate the mass of so2 molecule
6.calculate the mass of calcium atom
7. calculate the number of molecules present in 0.054g of water

can anyone help??​

Answer 1

Answer:

Hey, please follow class 9 NCERT. You will be able to solve them all.

Answer 2

Answer:

1. 7.3×$10^{-23}$

2. 2.68 ×$10^{19}$

Explanation:

1. Mass of 1 mole of C$O_{2}$ = Molecular mass of C$O_{2}$= 44g

So, mass of 6.022 ×$10^{23}$ Molecules of C$O_{2}$ = 44g

Therefore, Mass of 1 molecule of C$O_{2}$ = 44/6.022×$10^{23}$= 7.3×$10^{-23}$ g

2. Molar Volume of any gas at NTP = 22.4 L

So . No. of moles of Oxygen gas = 0.001/22.4= 4.64×$10^{-5}$

Therefore no. of Molecules of Oxygen = 4.64 ×$10^{-5}$ × 6.022 ×$10^{23}$ = 2.68 ×$10^{19}$

Remaining questions can easily be solved using similar concepts.

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