Question 1 (2 points)

1 answer:

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The solution to the polynomial expression since the power of the variable is in the second degree is 6.29 × 10² cm

<h3>What is the power of a variable?</h3>

The power of a variable refers to the exponent of the variable and the highest power of a variable is the degree to which the variable is being raised. From the information given, the highest power of the variable is a polynomial.

Given that:

$\mathbf{= 2.150 \times 10^2 \ cm + 7.34 \times 10^2 \ cm - 3.2 \times 10^2 \ cm }$

So, since the exponents are in the same power we are going to add them all together multiplied by their exponent.

i.e.

$\mathbf{= (2.150 + 7.34 - 3.2) \times 10^2\ cm }$

$\mathbf{= 6.29 \times 10^2\ cm }$

Learn more about the power of a variable here:

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At 20°C, a 0.756 M aqueous solution of ammonium chloride has a density of 1.0107 g/mL. What is the mass % of ammonium chloride i

Molodets [167]

Answer:

$\%m/m=4\%$

Explanation:

Hello,

In this case, by knowing that the molarity is measured in molal units which are mole per liter of solution and the by-mass percentage demands us to compute the mass of the solution, we proceed by assuming 1 L of solution:

$m_{solution}=1L*\frac{1000mL}{1L}*\frac{1.0107g}{1mL} =1010.7g$

Then, for 1 L of solution, we have 0.756 moles of solute (ammonium chloride), so we compute the grams for those moles by using its molar mass of 53.491 g/mol as shown below:

$m_{solute}=0.756mol*\frac{53.491g}{1mol}=40.4g$