Question

1. the name of kno₃ is potassium nitratide.
2. the law of constant composition states: all samples of a given compound have the same proportions of their constituent elements.

multiple choice. choose the one alternative that best completes the statement or answer.

1. how many of each type of atoms are there in the formula nh₄c₂h₃o₂? a) n = 1, h = 4, c = 2, o = 2 b) n = 4, h = 7, c = 2, o = 2 c) n = 1, h = 7, c = 2, o = 2 d) n = 1, h = 3, c = 2, o = 2 e) none of the above
2. carbon monoxide is considered which of the following? a) molecular compound b) ionic compound c) atomic element d) molecular element e) none of the above
3. what is the formula for an ionic compound made of magnesium and sulfur? a) mg₂s b) mgs c) mg₂s₃ d) mgs₂ e) none of the above
4. what is the oxygen - to - hydrogen mass ratio for h₂o₂? a) 0.125 b) 4 c) 8 d) 16 e) none of the above

Explanation:

Step1: Analyze atoms in NH₄C₂H₃O₂

N has 1 atom, H has 4 + 3=7 atoms, C has 2 atoms, O has 2 atoms.

Step2: Identify compound type of CO

Carbon - monoxide is formed by covalent bonding between carbon and oxygen, so it is a molecular compound.

Step3: Determine formula for ionic compound of Mg and S

Magnesium has a + 2 charge (Mg²⁺) and sulfur has a - 2 charge (S²⁻), so the formula is MgS.

Step4: Calculate O - H mass ratio in H₂O₂

The molar mass of H is 1 g/mol and of O is 16 g/mol. In H₂O₂, there are 2 H and 2 O. Mass of H = 2×1 = 2 g, mass of O = 2×16 = 32 g. The O - H mass ratio is $\frac{32}{2}=16$.

Answer:

1. C. N = 1, H = 7, C = 2, O = 2
2. A. molecular compound
3. B. MgS
4. D. 16