Answer:
all matter (everything) is made of the elements on the periodic table
Explanation:
A group of environmentalists were discussing the benefits and drawbacks associated with using fossil fuels. Which argument <span>best </span>fits the conversation?
Fossil fuels are cheaper than alternative forms of energy.Fossil fuel reserves will never be depleted.<span>Fossil fuels are easily renewed. </span><span>Fossil fuel use does not affect the environment.</span>
<span>The Iridium satellite
constellation is a satellite providing voice and data coverage to satellite
phones, pagers and integrated transceivers over the Earth’s entire surface. It was
discovered by Bary Bertiger, Rey Leopold and Ken Peterson in 1987 and then
developed by Motorola from 1993 to 1998.</span>
<u>Answer:</u> The mass of a solute is 35 grams
<u>Explanation:</u>
To calculate the mass percentage of solute, we use the equation:

Mass percent of solute = 10 %
Mass of solution = 350 g
Putting values in above equation, we get:

Hence, the mass of a solute is 35 grams
Answer:
54%
Explanation:
The balanced equation is:

The first step is to determine the limiting reactant. For this, we calculate the moles of each given component and divide the result for the stoichiometric coefficient.
3.4 g octane / 114.23 g/mol = 0.030 mol octane
0.030 mol octane/2=0.015
5.9 g O2 / 32 g/mol = 0.18 mol O2
0.18 mol O2/25= 0.0074 mol
The lower number, in this case oxygen, is the limiting reactant. The value corresponds to the theoretical yield of the reaction.
Similarly, the real yield is calculated from the product.
2.80 g CO2/ 44.01 g/mol = 0.0636 mol CO2
0.0636 mol CO2/16 = 0.00398 mol
The percent yield is the ratio of the 2 multiplied by a hundred, then
Percent yield= 0.0398/0.0074 *100 = 54%