how do these Qs thanks
1.a sample of hydrated zso4.nh2o is formed by o.1 mol zso4
combinining with 7.2g of water what is the value of n
No. of moles of water = 7.2 / (2+16) = 0.4
mol
hence 1 mol Zs04: 4 mol H2O
n =
4
2.in an experiment 3.0 mol of sodium hydrogencarbonate is heated
according to the following chemical equation
2nahco3 ---> na2co3+h20+co2
what is the volume of carbon dioxide measured at room
temperature and pressure produced in this experiment
According to the equation. no. of moles of
NaHCO3 : CO2 = 2:1
Hence 3 mol of NaHCO3 will produce 1.5 moles of
CO2.
1 mole of any gas at r.t.p = 24dm3
Hence 1.5x24 = 36 dm3 of carbon dioxide
produced.
3.the reaction between hydrogen gas and oxygen gas is shown
below
2h2+ 02 -----> 2h20
which of the following statment is correct
a 8g of steam cab be produced from 8 g of oxygen gas (which i
think is confirm wrong)
b 4 g of hydrogen reacting with 2g of oxygen produced 4g of
hydrogen
4g H2 = 2 mol
2g O2 = 2/32 = 0.0625 mol
c 0.5mol of steam can be produced from 0.25 mol of oxygen
gas
0.25 mol of O2 assuming it is limiting reactant will
produce 0.5 (2 x 0.25) mol of steam.
d 1.0g of steam cab be produced from 1.0g of hydrogen gas
once again, mass cannot be compare
directly.
ans is C by the way
4. write an ionic equation for
agno3(aq) + nacl(aq) -----> agcl(s) + nano3(aq)
AG+ (aq) + Cl- (aq) ==>
AgCl(s)
