Halfnium has three isotopes; 74% Hf-180, 17% Hf -176, and 9 % Hf- 177. Calculate the mass of Halfnium.

179.05 g/mol

Explanation:

simple called the percentage of the molecular mass of each isotope and add them together. their sum is the mass of Halfnium.

thus

Hf --- 74/100 × 180 = 133.2

Hf --- 17/100 × 176 = 29.92

Hf --- 9/100 × 177 = 15.93

total mass = 133.2+29.92+15.93

= 179.05 g/mol

plasma is the state of matter where the substance is ionized and has no definite shape or volume. the fact of being ionized makes the substance a good electrical conductor.

the answer is 75.0%.