Answer:
26.981539 u
Explanation:
One mole of Al atoms has a mass in grams that is numerically equivalent to the atomic mass of aluminum. The periodic table shows that the atomic mass (rounded to two decimal points) of Al is 26.98, so 1 mol of Al atoms has a mass of 26.98 g.
Electrical energy or the answer C
Answer:
Explanation:
The second best answer is likely well water. But it is possible that well water can be contaminated as well with soluble minerals.
See water would have salt in it which would make it hard to use.
River water could be containing dirt which would make washing hard to do.
Rain water is likely the best water to use.
Answer:
D
Explanation:
gravitational force: F=GmM/r^2
so this equation tells you that when mass increases force increases and when the distance increases force decreases
since the mass of the objects is the same in both cases, but distance is greater in case B than case A, case B has a smaller attractive force compared to A
