Calculate the mass of potassium in the sample : g Submit Answer Tries 0/3 Calculate the percent of potassium in the sample : % Submit Answer Tries 0/3 Calculate the volume of standard NaOH that reacted with iron : mL Submit Answer Tries 0/3 Calculate the mass of iron in the sample : g

Answer is explained below.

Explanation:

Calculate the mass of potassium in the sample :

1st equivalence point corresponds to K+ ;

mol K+ = moles of NaOH used in titration (from V1 ) = 0.100 mol/L * 6.00 ml/1000 ml/L = 0.00060 moles

mass of K+ in sample =  0.00060 moles* 39.1 g/mol = 0.02346 g

Calculate the percent of potassium in the sample :

mass of K+ in sample / mass of sample *100

0.02436 g / 0.195 g *100 = 12.03 %

Calculate the volume of standard NaOH that reacted with iron :

V2 -V1 = 16.40 ml - 6.00 ml = 10.40 mL

Calculate the mass of iron in the sample :

three moles of hydroxide ion are required to react with each mole of iron ion in the salt.

moles of Fe = 1/3* moles of NaOH used in titration (form V2 - V1) = 0.100 mol/L * 10.4 ml/1000 ml/L /3 = 0.000347 moles

mass of Fe in sample = (moles of Fe)(55.85 grams/mole) = 0.000347 moles*55.85 g/mol = 0.01936 g

Calculate the percent of iron in the sample :

mass of Fe in sample / mass of sample *100

0.01936 g / 0.195 g *100 = 9.93 %

- 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

why is cellular respiration important for homeostasis?

it changes food into energy that the organism can use.

which of the following is most likely to happen if a cell is not able to divide?

the cell will not be replaced when it is damaged.

explanation: