Answer:
a reaction in which oxidation numbers change
Explanation:
here you go happy to help
15.5% by mass is
equivalent 15.5 g urea in 100 g solution or 155 g urea in 1 kg solution. <span>
<span>we know that molality = moles solute / kg solvent
<span>moles solute = 155 g / 60 g/mol = 2.58 moles urea
</span></span></span>
Since there are 155 g
urea in 1000g solution, hence the solvent is 845 g or 0.845 kg
So:<span>
<span>molality = 2.58 / 0.845 = 3.06 m</span></span>
Answer:
0.8 moles
Explanation:
2H2+O2 —›2H2O
Since , from given balanced chemical Equation.
2moles of H2 produce 2 moles of Water
So,
2moles H2= 2moles H2O
1moles H2= 1 mole of H2O
For 0.8 mole of H2O, multiply both sides by 0.8
0.8 H2=0.8 H2O
0.8 mole of H2= 0.8 mole H2O
So answer is 0.8 moles