Question

Q1: Calculate the molecular mass of: (atomic mass of H=1u, O=16u , N=14u, C=12u, Cl=35.5u, )
e.
a. 0
b. H2O
C. CH, .
d. NH
HCI
f. CH,OH

Q2:An element has valency 3. Write the formula of its oxide.

Q3: Write the Latin name of sodium.

Q4: What is the name given to the number of 6.022 x 1023 particles?

Q5: Give an example of
i. divalent anion
ii. trivalent cation if, monovalent anion.

Q6:What do you understand by the statement "relative atomic mass of sulphur is 32"?

Q7: An element X has valency 3 while the element Y has valency 2. Write the formula of the
compound between X and Y.​

Answer 1

Answer:

1.f CH,OH

2.the valency of oxygen is 2 while element E is 3. the formula of the oxide of the element is E2O3