What are the units of your answer? You need a solubility, which is an amount per volume. If your amount is moles, the your solubility is in moles/liter: $\text{M}$. 

That unit appears in the Henry's Law constant! $6.1\times 10^{-4} \frac{\text{M}}{\text{atm}}$. What can you do to get rid of the atmospheres in the denominator? You probably need the pressure and the mole fraction.

Solubility, pressure and Henry's law
Completely new to QT and QML. I'm trying to set the color of a rectangle based on the relationship between the two propery doubles "callValue" and "handRaiseXBB", but I get the error "unexpected token if" and ""expected a qualified name id"

Could anyone tell me what I'm doing wrong? Thanks!

import QtQuick 2.0

Item{
id: hand

property double callValue: 0.0

property double handRaiseXBB: 100
property string handCallColor: "green"
property string handFoldColor: "grey"

Rectangle {
    anchors.fill: hand
    if(hand.callValue &gt;= hand.handRaiseXBB){
        color: hand.handFoldColor
    }
    else {
        color: hand.handCallColor
    }
}
}

