📝ATOMS AND MOLECULES QUESTIONS
1. In a reaction, 5.3 g of sodium
carbonate reacted with 6 g of
acetic acid. The products were
2.2 g of carbon dioxide, 0.9 g
water and 8.2 g of sodium Q acetate. Show that these observations are in agreement
with the law of conservation of
mass.
sodium carbonate + acetic acid
→ sodium acetate + carbon
dioxide + water.
2. Hydrogen and oxygen combine in
the ratio of 1:8 by mass to form
water. What mass of oxygen gas
would be required to react
completely with 3 g of hydrogen
gas?
3. A 0.24 g sample of compound of oxygen and boron was found
by analysis to contain 0.096 g of boron and 0.144 g of oxygen.
Calculate the percentage composition of the compound by
weight.
4. When 3.0 g of carbon is burnt in 8.00 g oxygen, 11.00 g of
carbon dioxide is produced. What mass of carbon dioxide will be formed when 3.00 g of carbon is burnt in 50.00 g of
oxygen? Which law of chemical combination will govern your
answer?
5. Which postulate of Dalton’s
atomic theory is the result of the
law of conservation of mass?
6. Which postulate of Dalton’s
atomic theory can explain the law
of definite proportions?
Hard questions 🥵
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