Radium (atomic number 88) has similar properties to barium and is also in the Group 2 category. However, radium is a radioactive element and is generally under the category of radioisotopes in addition to being an alkaline earth metal, because it is not a stable element.

4 0

3 years ago

a compound has an empirical formula of CH2 what is the molecular formula if it's molar mass is 252.5 grams/mol

Goryan [66]

Empirical formula is the simplest ratio of components making up the compound. the molecular formula is the actual ratio of components making up the compound.

the empirical formula is CH₂. We can find the mass of CH₂ one empirical unit and have to then find the number of empirical units in the molecular formula.

Mass of one empirical unit - CH₂ - 12 g/mol x 1 + 1 g/mol x 2 = 12 = 14 g

Molar mass of the compound is - 252 .5 g/mol

number of empirical units = molar mass / mass of empirical unit

= $\frac{252.5 g/mol}{14 g}$

= 18 units

Therefore molecular formula is - 18 times the empirical formula

molecular formula - CH₂ x 18 = C₁₈H₃₆

molecular formula is C₁₈H₃₆

8 0

3 years ago

Which of the following gases would diffuse the fastest? CH 4 CCl 4 O 2 H 2

Sholpan [36]

H2 because the smaller the gas molecule, the faster the diffusion. (the lightest molecule will diffuse the quickest)

8 0

3 years ago

What are parts of the nervous system

Vlad1618 [11]

Answer:

the brain and the spinal cord are the two main parts.

6 0

3 years ago