What do you mean by this?
D since Francium has an atomic number (mass) of 87
The boiling point (or condensation point) of a substance is defined as the temperature at which the vapor pressure of the liquid is exactly equal to the external pressure. Above the boiling point, the substance exists as a gas and below, it exists predominately as a liquid.
Answer:
2600 kg has 4 significant figures
Explanation:
Any different number to zero is a significant figure
For example, 1.8 → 2 significant figures
When you have 0 in the middle of two numbers, we consider it as a significant number
For example, 3.02 → 3 significant figures
When you have 0 on the left in the measure, we do not consider as a sgnificant figures
For example 0.0010 → 2 significant figures (10)
3.0 → 2 significant figures (0 is on the right, not the left)
Answer:
c. 1.25 mol
Explanation:
You might find it helpful to sort the information under the equation like a chart. "n" is the symbol for moles.
2 LiI(aq) + Cl₂(aq) → 2 LiCl(aq) + I₂(s)
n ? 2.50 mol
We are looking for the chemical amount of chlorine, or <u>moles of chlorine</u>.
To find the number of moles, you need the <u>mole ratio</u>.
The mole ratio is the same as the <u>coefficients</u> in the equation.
Cl₂ to LiCl
1 mol to 2 mol
<u>Start with the given</u> moles (2.50 mol for LiCl) and <u>multiply by the mole ratio</u>.
Since we are looking for molCl₂, write molCl₂ on top.
Units for molLiCl cancel out
<= notice that we keep 3 significant figures
The chemical amount of chlorine is 1.25 mol.