Hey
<span>
a 25.0ml dsmplr og 0.105M HCI was titrated with 31.5ml of NaOH. What is the concentration of the NaOH I got 0.0834M am I correct HCI + NaOH -----> H20 + NaCl 25.0ml HCI x 1L/1000mlx0.105 mol HCI/1L HCI X 1 mol NaOH/ I mol HCI = 0.0834M
</span>
Hoped That Helped You
2 C5H12O + 15 O2 = 10 CO2 + 12 H2O
Hope this helped :)
Period are going left to right across the periodic table
Groups are going up to down on the periodic table
Finding the difference in math usually means to subtract to numbers. In the case of your problem though, I think the correct answer would just be 4...