A gas X diffuses twice as fast as gas Y under the same conditions. If the relative molecular mass of X is 28. Calculate the relative molecular mass of Y?​

3. how much energy in joules is required to evaporate .0005 kg of liquid ammonia to vapor at the same temperature? 4. how much energy ( in megajoules ) is given up by .75 kg of water at 0c when it freezes to form ice at 0c? 5. explain how heat works between and at critical temperatures?

Determine the reaction and balance the following equations urgent due in the morning

To calculate percent by mass, use the equation below: calculate the percent by mass of each element. %n = % %h = % %o = %