Ametallurgist begins with 1,250 grams of vanadinite (pb5(vo4)3cl) and ends up with 135 grams of pure vanadium and 915 grams of pure lead. the percent composition of vanadium in the ore is , and the percent composition of lead is

1. 10.8%

2. 73.2%

Sample: 1,250 grams of vanadinite (Pb₅ (VO₄)₃Cl

Mass of Vanadium = 135 g

Mass of Pb = 915 g

Percentage of V = ?

Percentage of Pb =?

Using the formula;

The percentage composition is given by the formula;

= ( mass in grams of element / mass in grams of sample) × 100

Therefore;

The percentage of Vanadium;

  = (mass of V / mass of sample) × 100 = (135 g/ 1,250 g) × 100

   = 10.8 %

The percentage composition of Lead;

 = (mass of Pb / mass of sample) × 100 = (915 g / 1,250 g) × 100

  = 73.2%

yes they ca   is ur ansswerrr

- 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