Use an Alloy. Many outdoor structures, like this bridge, are made from COR-TEN steel to reduce the effects of rust. ...
Apply Oil. ...
Apply a Dry Coating. ...
Paint the Metal. ...
Store Properly. ...
Galvanize. ...
Blueing. ...
Powder Coating.
Answer: 1
Explanation: Step by Step
<h3>The enthalpy of combustion per mole of anthracene : 7064 kj/mol(- sign=exothermic)</h3><h3>Further explanation </h3>
The law of conservation of energy can be applied to heat changes, i.e. the heat received/absorbed is the same as the heat released
Q in = Q out
Heat can be calculated using the formula:
Q = mc∆T
Heat released by anthracene= Heat absorbed by water
Heat absorbed by water =
mol of anthracene (MW=178,23 g/mol)
The enthalpy of combustion per mole of anthracene :
The molecular weight of an unknown gas is 613.8 kg.
<u>Explanation:</u>
RMS or root mean square velocity is given by the formula,
RMS =
where R is the gas constant = 8.314 kgm²s⁻²K⁻¹mol⁻¹
T is the temperature in Kelvin = 50 + 273 = 323 K
Molar mass of the Nitrogen gas in kg is 0.028 kg/mol
So we can find the RMs of the nitrogen by plugin the above values in the above equation, we will get,
RMS =
= 536.4 m/s
Now we have to take half of RMS as 268.2 m/s
Now we have to rearrange the equation to get M as,
M =
Now the temperature is T = 130 + 273 = 403 K
Plugin the values as,
M =
= 613.8 kg/mol
So the molecular weight of an unknown gas is 613.8 kg.