calculate the energy required to raise the temp. of 170.0 g of silver (specific heat = .24 joules/celsius times grams) from 273K to 301K.
I know the equation and I got 1142.4 joules but need to get to 2 sig figs, so I converted it to 1.1 x 10^4 which is right, but it doesn't accept my makeshift multiplication sign or an asterick. Anything up for suggestion for this particular website?
well, you have the conversion wrong. It is 1.1E3, or 1.1*10^3, which is right. I don't know how it is written at the website you are working with.
To calculate the energy required, you can use the formula:
q = m * c * ΔT
Where:
q = heat energy (joules)
m = mass of the substance (in grams)
c = specific heat capacity (in joules/gram °C)
ΔT = change in temperature (in °C)
In this case, you have:
m = 170.0 g (mass of silver)
c = 0.24 J/g°C (specific heat capacity of silver)
ΔT = (301°C - 273°C) = 28°C (change in temperature)
Now, substitute the given values into the formula:
q = (170.0 g) * (0.24 J/g°C) * (28°C)
q = 1142.4 J
You correctly calculated the answer as 1142.4 joules.
To convert it to 2 significant figures, which is 1.1 x 10^4 joules, you can use scientific notation. However, if the website doesn't accept the makeshift multiplication sign (*) or an asterisk, you can try using the letter "x" or the dot operator (·). For example, you can write it as 1.1 x 10^4 or 1.1 x 10^4 joules.
If none of these options work on the specific website, it's possible that the website has a specific format or input requirement. In that case, you may need to consult the website's instructions or try reaching out to their support for assistance.