how to find the number of moles in each: 1). 45.1 grams (NH4) 2 SO4 =? 2). 11.8 grams of Chlorine =? 3). 150 g?
chemists hai ....,
does anybody know how to find the number of moles in each:
1). 45.1 grams (NH4) 2 SO4 =?
2). 11.8 grams of Chlorine =?
3). 150 grams of Neon =?
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Moles = mass in grams / molecular weight aka molar mass
Molar mass is determined by multiplying each element's weight (from your periodic table) by the number of times it appears in the formula and adding them all together.
Eg (NH4)2SO4 molar mass:
2 X N (14.01) + 8 x H (1.01) + 1 x S (32.07) + 4 x O (16.00) = 132.16 g/mol
Now to determine moles in 45.1g, divide by 132.16g/mol & you get 0.3413 mol (the grams cancel out in the calculation)