Question

1) The number of molecules of CO, present in 44 g of Co, is
a) 6.0 x 1023
b) 3 x 1023
c) 12 x 1023
d) 3 x 1010
2) The maximum number of molecules are present in
a) 15 L of Hy gas at STP b) 5 L of N2 gas at STP
c) 0.5 g of H2
d) 10 g of Oz gas
3) Which one of the following has maximum number of atoms of oxygen?
a) 2 g of carbon monoxide b)2 g of carbon dioxide c)2 g of sulphur dioxide
d) 2g of water
4) Which of the following contains greatest number of oxygen atoms?
a) 1 g of o b) 1 g of Oz c) 1 g of O; d) All have the same number of atoms
5) The number of hydrogen atoms present in 25.6 g of sucrose (C12H22011) which has a molar mass of 342.3 g
a) 22 x 10-
b) 9.91 x 1023
c) 11 x 1023
d) 44 x 1023
6) A signature, written in carbon pencil weights 1 mg. What is the number of carbon atoms present in the
signature?
a) 5.02 x 1023 b) 5.02 x 1020
c) 6.02 x 1020
d) 0.502 x 1020
7) 2 g of O, at 0°C and 760 mm of Hg pressure has volume
a) 1.4 L
b) 2.8 L
c) 11.2 L
d) 22.4L​

Answer 1

Answer:

6*1023is the anser of 1st