Answer:
56
Explanation:
1 mole of gas at STP occupies 22.4 L of the gas
2.5 mole of the gas at STP occupies 22.4×2.5 L of the gas
so 2.5 mole of the gas at STP occupies 56 L of the gas .
Answer : The mass of sample is, 267.5 grams.
Explanation :
Density : It is defined as the mass of a substance contained per unit volume.
Formula used :

Given:
Volume of Pb = 
Density of Pb = 
Now put all the given values in the above formula, we get the mass of Pb.


Therefore, the mass of sample is, 267.5 grams.
Answer:
Explanation:
1)6
2)0
3)2
4)2
r the no. of atoms present in the molecules
Answer:
There is actually 1 mole in 54.3 g of CO2
Answer:
compound
Explanation:
because it is made up of pure substance consists of atom