Question

M (NaOH) - 8 г + CO2m (NaCO3) - ?

Answer 1

Ответ:

2naoh+co2=na2co3+h2o

n(naoh)=8/40=0.2моль

n(na2co3)=2.0/2=0.1моль

m(na2co3)=0.1×106=10.6

Answer 2

To determine the molar mass of sodium hydroxide (NaOH) and the molar mass of sodium carbonate (Na2CO3), you can use the periodic table to find the atomic masses of the individual elements and then add them up based on their chemical formulas.

1. Sodium hydroxide (NaOH):
   • Sodium (Na) has an atomic mass of approximately 22.99 g/mol.
   • Oxygen (O) has an atomic mass of approximately 16.00 g/mol.
   • Hydrogen (H) has an atomic mass of approximately 1.01 g/mol.

Now, you can calculate the molar mass of NaOH:

M(NaOH) = (1 * M(Na)) + (1 * M(O)) + (1 * M(H)) M(NaOH) = (1 * 22.99 g/mol) + (1 * 16.00 g/mol) + (1 * 1.01 g/mol) M(NaOH) = 22.99 g/mol + 16.00 g/mol + 1.01 g/mol M(NaOH) = 40.00 g/mol

So, the molar mass of sodium hydroxide (NaOH) is 40.00 g/mol.

2. Sodium carbonate (Na2CO3):
   • Sodium (Na) has an atomic mass of approximately 22.99 g/mol.
   • Carbon (C) has an atomic mass of approximately 12.01 g/mol.
   • Oxygen (O) has an atomic mass of approximately 16.00 g/mol.

Now, you can calculate the molar mass of Na2CO3:

M(Na2CO3) = (2 * M(Na)) + (1 * M(C)) + (3 * M(O)) M(Na2CO3) = (2 * 22.99 g/mol) + (1 * 12.01 g/mol) + (3 * 16.00 g/mol) M(Na2CO3) = 45.98 g/mol + 12.01 g/mol + 48.00 g/mol M(Na2CO3) = 105.99 g/mol

So, the molar mass of sodium carbonate (Na2CO3) is 105.99 g/mol.

Now that you have the molar masses of NaOH and Na2CO3, you can use them to calculate the number of moles (m) for 8 grams of NaOH and then determine the number of moles (m) of Na2CO3 that would have the same mass:

For NaOH: m(NaOH) = 8 g / M(NaOH) = 8 g / 40.00 g/mol = 0.2 moles

Now, to find the mass of Na2CO3 (CO2m) that contains the same number of moles: CO2m(Na2CO3) = m(NaOH) * (M(Na2CO3) / M(NaOH)) CO2m(Na2CO3) = 0.2 moles * (105.99 g/mol / 40.00 g/mol) = 0.2 moles * 2.64975 CO2m(Na2CO3) ≈ 0.53 grams

So, approximately 0.53 grams of sodium carbonate (Na2CO3) would have the same number of moles as 8 grams of sodium hydroxide (NaOH).