## what's wrong in this code in part 2 it should give answer same the solution part 1

Private Sub mnuFileCloce_Click()

End

## End Sub

'para1

Private Sub Text1_Change()

Dim K1, K2, K3, K4, K5, K6, K7, K8, K9 As Double

Dim Tc, Pc, T, X, Xx, Xy, Xz, P As Double

K1 = -7.691234564

K2 = -26.08023696

K3 = -168.1706546

K4 = 64.23285504

K5 = -118.9646225

K6 = 4.167117732

K7 = 20.9750676

K8 = 1000000000#

K9 = 6#

Ts = Val(Text1.Text)

Tc = 647.3

Pc = 22120#

T = Ts + 273.15

X = T / Tc

Xx = 1 + K6 * (1 - X) + K7 * (1 - X) ^ 2

Xy = K8 * (1 - X) ^ 2 + K9

Xz = K1 * (1 - X) + K2 * (1 - X) ^ 2 + K3 * (1 - X) ^ 3 + K4 * (1 - X) ^ 4 + K5 * (1 - X) ^ 5

Ps = Pc * Exp(((1 / X) * Xz) / Xx - (1 - X) / Xy)

Text2.Text = Str(Ps)

If Text1.Text = "" Then Text2.Text = ""

If Text4.Text = "" Then Text3.Text = ""

## End Sub

'part 2

Private Sub Text4_Change()

Dim K1, K2, K3, K4, K5, K6, K7, K8, K9 As Double

Dim Tc, Pc, T, Ts, X, Xx, Xy, Xz, Ps, P As Double

Dim A1, A2, A3, A4, A5, A6, PDIF As Double

Dim I As Long

A1 = 46.8922631

A2 = 3.61025379

A3 = -0.181752837

A4 = -0.00657409

A5 = -0.010390705

A6 = -0.00228354

K1 = -7.691234564

K2 = -26.08023696

K3 = -168.1706546

K4 = 64.23285504

K5 = -118.9646225

K6 = 4.167117732

K7 = 20.9750676

K8 = 1000000000

K9 = 6

I = 0

Pc = 22120

Ps = Val(Text4.Text)

P1 = (A1 + (A2 * Ps))

P2 = (A3 * Ps ^ 2)

P3 = (A4 * Ps ^ 3)

P4 = (A5 * Ps ^ 4)

P5 = (A6 * Ps ^ 5)

Ts = P1 + P2 + P3 + P4 + P5

30

T = Ts + 273.15

Tc = 647.3

X = T / Tc

Xx = 1 + K6 * (1 - X) + K7 * (1 - X) ^ 2

Xy = K8 * (1 - X) ^ 2 + K9

Xz = K1 * (1 - X) + K2 * (1 - X) ^ 2 + K3 * (1 - X) ^ 3 + K4 * (1 - X) ^ 4 + K5 * (1 - X) ^ 5

P = Pc * Exp((((1 / X) * Xz) / (Xx)) - ((1 - X) / Xy))

PDIF = Ps * 100# / P

If PDIF > 1.0001 Or PDIF < 0.9999 Then

Ts = Ts * ((PDIF) ^ 0.5)

I = I + 1

Label9.Caption = Str(I)

GoTo 30

End If

Text3.Text = Str(Ts)

If Text4.Text = "" Then Text3.Text = ""

End Sub