Hi!! I really need help for calculations. I'm not understanding a thing!!!!!!!!
i also need so much help. cant do anything with moles!!!
1 mole is it's relative atomic mass in grams
To work out how many moles are of an element, use the formula;
no of moles= mass(g) divided by R.A.M
For example, "How many moles of sodium are there in 2.3g?"
2.3/23=0.1 so there are 0.1 moles.
Hope this helped, but im a bit rubbish at explaining thingss :P Good Luck!
helo.i saw your post and think i can be of help to you
You could try this section of the site:
A ball is dropped from the leaning tower of Pisa, at a height of 50m from the ground. The ball is dropped from rest and falls freely under gravity. How long will it be before the ball hits the ground?
We know: s = 50, a = 9.8, u = 0 and we want to find t.
The equation connecting these four is s = ut + ½ at2
So 50 = 0 + ½ × 9.8 × t2
Rearranging: t2 = 10.20408
t = 3.19…
the time taken is 3.19s (3sf)
CAN SOMEONE ASSIST ME BY EXPLAINING HOW THEY GOT THE 3.19 BECAUSE TO MY UNDERSTANDING I UNDERSTAND THAT YOU HAVE TO RE ARRANGE THE FORMULA AND MAKE "T" THE SUBJECT OF THE FORMULA BECAUSE THATS WHAT WE WERE ASKED TO FIND
which calculations? molar? redox? thermo?
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