1)
Phản ứng xảy ra:
\(C + {O_2}\xrightarrow{{{t^o}}}C{O_2}\)
a)
Ta có:
\({n_{{O_2}}} = \frac{{6,4}}{{16.2}} = 0,2{\text{ mol = }}{{\text{n}}_{C{O_2}}}\)
\( \to {m_{C{O_2}}} = 0,2.44 = 8,8{\text{ gam}}\)
b)
\({n_{C{O_2}}} = {n_C} = 0,3{\text{ mol}}\)
\( \to {m_{C{O_2}}} = 0,3.44 = 13,2{\text{ gam}}\)
c)
\({n_C} > {n_{{O_2}}}\) nên \(C\) dư
\( \to {n_{C{O_2}}} = {n_{{O_2}}} = 0,2{\text{ mol}}\)
\( \to {m_{C{O_2}}} = 0,2.44 = 8,8{\text{ gam}}\)
d)
Ta có:
\({n_C} = \frac{6}{{12}} = 0,5{\text{ mol;}}{{\text{n}}_{{O_2}}} = \frac{{19,2}}{{16.2}} = 0,6{\text{ mol > }}{{\text{n}}_C}\)
Vậy \(O_2\) dư
\( \to {n_{C{O_2}}} = {n_C} = 0,5{\text{ mol}}\)
\( \to {m_{C{O_2}}} = 0,5.44 = 22{\text{ gam}}\)
2)
Phản ứng xảy ra:
\(S + {O_2}\xrightarrow{{{t^o}}}S{O_2}\)
Ta có:
\({n_{S{O_2}}} = \frac{{19,2}}{{32 + 16.2}} = 0,3{\text{ mol = }}{{\text{n}}_S} = {n_{{O_2}{\text{ phản ứng}}}}\)
\( \to {m_S} = 0,3.32 = 9,6{\text{ gam}}\)
\({m_{{O_2}{\text{ phản ứng}}}} = 0,3.16.2 = 9,6{\text{ gam}}\)
\( \to {m_{{O_2}{\text{ dư}}}} = 15 - 9,6 = 5,4{\text{ gam}}\)