Please answer I need this to get a good grade. (;

94.74 mol NO₂

General Formulas and Concepts:

Chemistry - Stoichiometry

Explanation:

Step 1: Define

3714 L O₂ at STP

Step 2: Identify Conversions

RxN:   7 mol O₂ = 4 mol NO₂

STP:   22.4 L = 1 mol

Step 3: Stoichiometry

= 94.7449 mol NO₂

Step 4: Check

We are given 4 sig figs. Follow sig fig rules and round.

94.7449 mol NO₂ ≈ 94.74 mol NO₂

- 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

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)