A chemist adds 425.0 mL of a 0.62 M barium chloride (BaCl2) solution to a reaction flask. Calculate the millimoles of barium chloride the chemist has added to the flask. Be sure your answer has the correct number of significant digits.

263,5 millimoles

Explanation:

Molarity (M) is an unit of concentration that refers the ratio between moles of solute and Liters of solvent in a solution. 0,62M means 0,62 moles of solute per liter of solution. Thus, moles of BaCl₂ are:

0,425L × (0,62mol / L) = 0,2635 mol of BaCl₂. In millimoles:

0,2632 mol × (1000mmoles / 1mol) = 263,5 millimoles

I hope it helps!

- calcium has greater affinity to bond with electron receptors than hydrogen does and hence, it has the ability to replace hydrogen in most of its compounds.

- lithium has 2 valence electrons in the product because it can make only 1 bond with hydrogen. beryllium has 4 valence electrons in the product because it can only make 2 bonds. it has fewer electrons than neon and can react with electron donors. each hydrogen has 2 valence electrons, the same as helium.

- the covalent bond formed between carbon and hydrogen is polar because carbon is more electronegative than hydrogen and it attracts the bonded electron pair closer to itself, thus giving hydrogen a partial positive charge.

- a hydrogen bond is a relatively weak bond that hydrogen atoms make with the electronegative atoms nitrogen, oxygen or fluorine.

so the best choice is a.) 2 calcium (ca) atoms