Arnold K H Tan's answer to Hhgb gg's Secondary 4 A Maths Singapore question.
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You can also use moles, but this is faster. Moles steps:
1. Moles of NaHCO3 in 25.2g = p
2. NaHCO3 : Na2CO3 = 2 : 1
3. So moles Na2CO3 = p/2
4. Calculate mass of Na2CO3
1. Moles of NaHCO3 in 25.2g = p
2. NaHCO3 : Na2CO3 = 2 : 1
3. So moles Na2CO3 = p/2
4. Calculate mass of Na2CO3
Date Posted:
2 years ago
But why i got is NaCO3 has 0.15/2 moles. Then times mr, i got 7.95 g?
Moles of Na2CO3 is 0.15... not 0.15÷ 2. Note the moles of NaHCO3 is 0.3.
Ok understand alr ty
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