Oefeningen en modeloplossing
Oefeningen en modeloplossing
Oefeningen en modeloplossing
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10. Hoeveel gram chloorgas heeft m<strong>en</strong> nodig om met 5 g calcium te reager<strong>en</strong> tot calciumchloride?<br />
Cl2 + Ca → CaCl2<br />
n = 1 mol n = 1 mol n = 1 mol<br />
m = 5 g<br />
n = m / M<br />
= 5 g / 40 g/mol<br />
= 0,125 mol<br />
n = 0,125 mol n = 0,125 mol<br />
m = n . M m = n . M<br />
= 0,125 mol . 71 g/mol = 0,125 mol . 111 g/mol<br />
= 8,9 g = 13,9 g<br />
11. 4,0 kg ongebluste kalk (CaO) reageert met water <strong>en</strong> vormt gebluste kalk (Ca(OH)2). Hoeveel water is<br />
nodig?<br />
CaO + H2O → Ca(OH)2<br />
n = 1 mol n = 1 mol n = 1 mol<br />
m = 4000 g<br />
n = m / M<br />
= 4000 g / 56 g/mol<br />
= 71,4 mol<br />
n = 71,4 mol n = 71,4 mol<br />
m = n . M<br />
= 71,4 mol . 18 g/mol<br />
= 1,3 kg<br />
12. Hoeveel gram koolstof <strong>en</strong> zuurstofgas moet<strong>en</strong> onderling reager<strong>en</strong> om 20 g CO2 te vorm<strong>en</strong>?<br />
O2 + C → CO2<br />
n = 1 mol n = 1 mol n = 1 mol<br />
m = 6 g m = 20 g<br />
n = m / M<br />
= 20 g / 44 g/mol<br />
= 0,45 mol<br />
n = 0,45 mol n = 0,45 mol<br />
m = n . M m = n . M<br />
= 0,45 mol . 32 g/mol = 0,45 mol . 12 g/mol<br />
= 14,5 g = 5,5 g
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