Question

Which ratio would be used to determine how many moles of water are produced by reacting 15 mol of oxygen in excess hydrogen?

2H2 + O2 ----> 2H2O

Answer 1

A. 1 mol O2/1 mol H2O
B. 1 mol H2O/1 mol O2
C. 2 mol H2O/1 mol O2
D. 1 mol O2/2 mol H2O

Answer 2

@ghuczek please help me

Answer 3

@Somy help please

Answer 4

In the balanced equation hydrogen and water are in a 1 : 1 ratio.

Answer 5

so it's A?

Answer 6

\[\color{green}{\checkmark}\]

Answer 7

How many moles of lithium are needed to completely react with 4.6 mol Br2?

2Li + Br2 2LiBr

A. 9.2 mol
B. 8.4 mol
C. 4.6 mol
D. 2.3 mol

Answer 8

What's the answer? @ghuczek

Answer 9

Use ratios and proportions. Notice in the balanced equation that 2 moles of Li are needed for every mole of bromine. So,\[\color{green}{\dfrac{2~\text{mol of Li}}{1~ \text{mol of Br}_2} = \dfrac{x~\text{mol of Li}}{4.6~\text{mol of Br}_2}}\]
Cross multiply:\[\color{green}{(2~\text{mol of Li}) \times (4.6~\text{mol of Br}_2) = (x~\text{mol of Li}) \times (1~\text{mol of Br}_2)}\] and solve for x.