Question

1. True or false? Underline your choice.

a. A mole of a substance is defined as the amount that contains the same
number of units as the number of atoms in 1 gram of hydrogen gas.
true / false

b. The Avogadro number is the number of atoms in 12 g of carbon-12. true / false

c. 1 mole of water molecules contains 3 moles of atoms. true / false

d. 1 dm3 of carbon monoxide gas (CO) contains the same number of molecules
as 1 dm3 of carbon dioxide gas (CO2). true / false

e. 80 g of calcium contains more atoms than 80 g of sulfur.
(Ar: S 5 32, Ca 5 40) true / false

f. The molecular formula is never the same as the empirical formula. true / false


2)
a. How many atoms are there in 71 g of chlorine? (Ar: Cl 5 35.5)






b. What is the mass of 0.2 moles of potassium hydroxide, KOH?





c.How many moles of atoms are there in 1.4 g of lithium?








d.What is the mass of 4 moles of sulfur molecules, S8?







e.How many moles of water molecules are there in 50 g of hydrated calcium nitrate, Ca(NO3)2.2H2O?

Answer 1

Answer:

true

hope you understand

Answer 2

Answer:

1) true

2) true

3) true

4) true

5) true

6) true