Most bonds are made when a positive atom or molecule (one that is missing an electron in its outer shell) accepts an electron from a negative atom or molecule. Hydrogen is a positive ion because it only has one electron in its outer shell instead of a pair. Oxygen has paired electrons, but because it is highly electronegative one of the outer electrons is held closer to the nucleus, creating a partial negative charge. This partial negative charge attracts the electron in the outer shell of hydrogen and creates a bond. This type of bond accounts for the high surface tension in water.
The mass of magnesium chloride produced is calculated as follows
write the equation for reaction
Mg +2HCl=MgCl +H2
find the moles of each reactant
moles = mass/molar mass
moles for mass = 32.5 g/24.3 g/mol= 1.34 moles
moles for HCl = 32.5g / 95.3 g/mol=0.89 moles
HCl is the limiting reagent hence by use of mole ratio between HCl to MgCl2 which is 2:1 the moles of MgCl2 is therefore = 0.89/2 =0.445 moles
mass of MgCl2 is therefore= moles/molar mass
=0.445moles x 95.3 g/mol= 42.4 grams of MgCl2
You need the heat of fusion of ice to solve this problem. <span>the heat of fusion of water = 334 J/g </span><span>
the formula to solve for heat is </span>q = m·ΔH<span>f</span>
just plug the values
q= (50.0 g) (334 j/g)= 16700 joules or 16.7 Kj
4.5x10^22.
How many molecules are in 2.10 mol CO2? 1.26x10^24 molecules.
What is the molar mass of AuCl3?