Answer:
Percent by mass is calculated by tihis formula, Mass of solute (g) ÷ mass of solution (g)] × 100.
Explanation:
For example: if you have a solution 45% m/m (mass percentege), you have 45 g of solute in 100 g of solution.
Answer:
Relative abundance of each isotopes of an element.
Explanation:
Consider the following example:
Uranium is used in nuclear reactors and is a rare element on earth. Uranium has three common isotopes. If the abundance of 234U is 0.01% the abundance of 235U is 0.71% and the abundance of 238U is 99.28% what is the average atomic mass of uranium
Abundance of U²³⁴ = 0.01%
Abundance of U²³⁵ = 0.17%
Abundance of U²³⁸ = 99.28%
Average atomic mass = ?
Solution:
Average atomic mass of uranium = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass) +(abundance of 3rd isotope × its atomic mass) / 100
Average atomic mass of uranium= (234×0.01)+(235×0.71)+(238×99.28)/100
Average atomic mass of uranium= 2.34 + 166.85 + 23628.64 / 100
Average atomic mass of uranium= 23797.83 / 100
Average atomic mass of uranium= 237.98 amu.
The mesosphere is<span> the layer of the </span>Earth's atmosphere<span> that is directly above the </span>stratosphere<span> and directly below the </span>mesopause<span>. In the mesosphere, </span>temperature<span> decreases as the </span>altitude<span> increases. The upper boundary of the mesosphere is the mesopause, which can be the coldest naturally occurring place on Earth</span><span>[citation needed]</span><span> with temperatures below −143 °C (−225 °F; 130 K). T</span>
<h2>
Answer: 125.41 mL</h2>
Explanation:
Volume = mass ÷ density
= 116 g ÷ 0.925 g/mL
= 125.41 mL
<h3>A 116 g of sunflower oil of 0.925 g/mL has a volume of 125.41 mL.</h3>
It’s neutral with a pH of 7. It’s probably water.
