Answer:
The correct answer is B
Explanation:
This question seeks to test the difference between mass and weight.
Mass is a measurement of the amount of matter present in an object. While <u><em>weight is a measurement of the force of gravity pulling (the mass of) an object</em></u>. Hence, measuring the weight of the moon rocks in the moon might be a waste since the weight of the object on earth will produce a different value due to the difference in the force of gravity between the earth and the moon.
It's the last answer. The gas-filled sacs allow for it to float, which means it's closer to the surface where the sun is. The top of the kelp collects the nutrients it needs from the sunlight and transfers it throughout the rest of it. Hope this helped!
Answer:
mNaCl = mNa + mCl
mNa = 20g
mCl = mCl2/2 = 30/2 = 15g
mNaCl= 20+15 = 35g
Moles of water atoms = mass/molecular weight = 105/18 = 5.83 mol. Number of moles of hydrogen in water = 2 x moles of water = 11.66. Number of H atoms in water = moles of hydrogen x 6.02 x 10^23 = 7.019 x 10^24 ~ 7.02 x 10^24 atoms. Hope this helps.
0.2 is the correct answer and shown above is the shown work