Answer:
magnesium (Mg)
Explanation:
Both are in group 2 and because of that share the same chemical properties.
Mass of water is 11.52 grams.
Overall chemical equation for reaction of combustion a compound containing only carbon and hydrogen:
CxHy + O₂ → xCO₂ + y/2H₂O
m(CxHy) = 7.02 g; mass of the compound
m(O₂) = 25.5 g; mass of oxygen
m(CO₂) = 21.0 g; mass of carbon dioxide
m(H₂O) = ?; mass of water
Conservation of matter states that the mass of the reactants have to be equal to the mass of the products.
m(CxHy) + m(O₂) = m(CO₂) + m(H₂O)
7.02 g + 25.5 g = 21.0 g + m(H₂O)
m(H₂O) = 32.52 g - 21.0 g
m(H₂O) = 11.52 g; mass of water
More about conservation of matter: brainly.com/question/18318085
#SPJ4
the balanced equation for the above reaction is as follows;
3NiCl₂ + 2K₃PO₄ ---> Ni₃(PO₄)₂ + 6KCl
stoichiometry of NiCl₂ to K₃PO₄ is 3:2
the number of NiCl₂ moles reacted - 0.0102 mol/L x 0.134 L = 0.00137 mol
according to molar ratio
if 3 mol of NiCl₂ reacts with 2 mol of K₃PO₄
then 0.00137 mol of NiCl₂ reacts with - 2/3 x 0.00137 = 0.000911 mol of K₃PO₄
molarity of given K₃PO₄ solution - 0.205 M
there are 0.205 mol in 1000 mL
therefore volume of 0.000911 mol - 0.000911 mol / 0.205 mol/L = 4.44 mL
volume of K₃PO₄ needed is 4.44 mL
Based on Hess's Law:
<span>2 N2(g) + 6 O2(g) + 2 H2(g) −→ 4 HNO3(l) ∆Hf = (−171.9 kJ/mol)(4 mol) </span>
<span>2 H2O(l) −→ 2 H2(g) + O2(g) ∆Hf = (-283.8 kJ/mol)(2 mol)(-1) →times -1, rxn is reversed </span>
<span>4 HNO3(l)−→ 2 N2O5(g) + 2 H2O(l) ∆Hf = (-76.4 kJ/mol)(2 mol)(-1) →times -1, rxn is reversed </span>
<span>2 N2(g) + 5 O2(g) −→ 2 N2O5(g) ∆H0 = 32.8 kJ</span>
Explanation:
When using public transport vehicles instead of private cars, we emit less pollution. For example in a bus more than 20 people travel, so the pollution per person is lower.
When we increase speed we usually consume more fuel, so avoiding accelerating rapidly we also reduce pollution.
Answer:
a) public transport vehicles.
b) accelerating rapidly.
