Answer:
[See Below]
Explanation:
✦ A beaker of liquid would measure the volume of a liquid.
✦ A graduated cylinder is good for estimating the volume of a liquid.
✦ You'd most likely use a tape measure to measure the wall length and width.
~<em>Hope this helps Mate. If you need anything feel free to message me. </em>
We will use this formula:
M1C1ΔT1 = M2C2ΔT2
when M1 mass of sample 1 = 31 g
C1 for water = 4.184
and ΔT1 = (Tf- 290)
and M2 of sample 2 = 47 g
C2 for water = 4.184
and ΔT2 = (340 - Tf)
so by substitution, we can get Tf (the final temperature):
31 g * 4.184 * ( Tf - 290 k ) = 47g * 4.184 * (340 - Tf)
∴Tf ( the final temperature) = 320 K
<span>The answer to your question is the 3rd option </span>
The unit of 16.8 /kjg contains a mistake.
I just can help you by assuming the right units.
I will assume 16.8 kj /g. This is a rate, which means that 1 g of reactant will produce 16.8 kj of heat.
To calculate the mass of reactant that will produce 800j first you multiply by the conversion factor to obtain kj, and the you divide by the rate of heat, 16.8 kj/g
heat * conversion factor / rate
(800j) * (1kj/1000j) / (16.8 kj / g) <--- answer