Figure $5\mathrm{.}1$ provides steady$-$state test data for a process in which two entering streams of air mix to form a single exiting stream. Assume that heat transfer and kinetic and potential energy effects are negligible. A hard$-$to$-$read photocopy of the data sheet indicates that the pressure of the exiting stream is either $1\mathrm{.}0$MPa or $1\mathrm{.}8$MPa. Assuming the ideal gas model for air with $cp$ as a function of temperature $($temperature change is larger than $50C)?K,$ determine if either or both of these pressure values can be correct.

$T_1=800K$

$p_1=1\mathrm{.}8MP$

$m_1^{}=1k\frac{g}{s}$

$T_2=650K$

$p_2=1\mathrm{.}0MP$

$m_2^{}=2k\frac{g}{s}$

Fig $5\mathrm{.}1$ Steady$-$state test of problem $5$