To detect the presence of certain elements, primarily metal irons based of each elements characteristics emission spectrum
You are given
the mass of CaH2 which is 14 grams and H2O which is 28 grams. You are required
to find the maximum volume of H2 gas at STP. The balanced chemical reaction is
CaH2 + 2H2O -> Ca(OH)2 + H2. Note that for every one mole of CaH2, 2 moles
of H2O is needed to completely react and produce Ca(OH)2 + H2. So the CaH2 and
H2O are at equal proportions. At STP, temperature is at 0°C(273K) and pressure
at 1 atm. The molar mass of CaH2 is 42 grams per mole.
14g CaH2(1mol
CaH2/42 grams CaH2)(1mol H2/1mol CaH2) = 0.333 moles H2
The ideal gas
equation is PV=nRT, with R(gas constant) = 0.08206 L-atm/mol-K. Get the equation
for volume, we have
V=nRT/P
V=(0.333molH2)(
0.08206 L-atm/mol-K)(273K)/1atm
<u>V=7.47L</u>
Clay is used in pottery for its ability to be manipulated by the bare hands of humans, and it dries very quickly. Since you dont need a lot of equipment, it was a high paying job back in the old times. An advantage of clay that it can keep the water cool for a long time as long as you cover the container.
Another advantage is that clay doesnt react with the liquids or food inside when heat is applied ( Unlike plastic)
Answer:
Alkali metals are soft and have low melting points.
Answer:
0.1 M
<h3>
Explanation:</h3>
- Molarity refers to the concentration of a solution in moles per liter.
- It is calculated by dividing the number of moles of solute by the volume of solvent;
- Molarity = Moles of the solute ÷ Volume of the solvent
<u>In this case, we are given;</u>
- Number of moles of the solute, NH₄Cl as 0.42 moles
- Volume of the solvent, water as 4200 mL or 4.2 L
Therefore;
Molarity = 0.42 moles ÷ 4.2 L
= 0.1 mol/L or 0.1 M
Thus, the molarity of the solution will be 0.1 M
