Determine the molarity of a solution that is prepared by adding 600 ml of water to a 200 ml of 0.450 m solution of k2cr2o7 ?

0.1125 M

Explanation:

Molarity of a solution is number of moles of solute dissolved in 1 L of solution

600 mL of water is added to 200 mL of a 0.450 M solution of K₂Cr₂O₇

number of moles of K₂Cr₂O₇ remain the same but more water is added therefore volume changes making the solution more dilute

first we need to find the number of moles of K₂Cr₂O₇ already in solution

molarity = number of moles of K₂Cr₂O₇ / volume of solution

substituting values in the equation

0.450 mol/L = number of moles / 0.2 L

number of moles = 0.09 mol

there are 0.09 mol of K₂Cr₂O₇ and the new volume is 200 mL + 600 mL = 800 mL

molarity = 0.09 mol / 0.8 L

molarity = 0.1125 mol/L

new molarity is 0.1125 M

- 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

he uptake of drugs from the intestine is often strongly influenced by diffusion. for example, consider a water-insoluble steroid for treating inflammation that is solubilized in aggregates of detergent molecules, called micelles. these micelles, aggregates of 80 soap molecules, have a molecular weight of 24,000, a diameter of 2.6 nm, and a charge of -27. the positively charge ions (counterions) in this system are na".