Balance the equation for the reaction given below: CuCl2 + NaNO3  Cu(NO3)2 + NaCl

1.26 * 10^4 + 2.50 * 10^4 in sceintific notation

eduard

Hello! I can help you with this. First, convert them into it’s written out standard form. 10^4 is 10,000. 10,00 * 1.26 is 12,600. 10,000 * 2.5 is 25,000. 12,600 + 25,000 = 37,600 or 3.76 * 10^4 in scientific notation. The answer in scientific notation is 3.76 * 10^4.

8 0

3 years ago

What is the molarity of a salt solution made by dissolving 250.0 grams of NaCl in 775 mL of solution?

tester [92]

The molarity of a salt solution made by dissolving 250.0 grams of NaCl in 775 mL of solution is 5.52 M .

Explanation:

The molarity of a solution tells one how many moles of solute one can get per liter of solution.One should remember to must convert this volume to liters by using the conversion factor:

1 L = 10³ml

Sodium chloride (NaCl) has a molar mass of 58.44 g per mol , which means that the sample will contain:

$250 \mathrm{g} \times \frac{1 \text { mole of } \mathrm{Nacl}}{58.44 \mathrm{g}}=4.278 \text { mole of } \mathrm{Nacl}$

This means that the molarity of the solution will be:

$\text {Molarity,c}=\frac{n_{\text {solute}}}{V_{\text {solution }}}=\frac{4.28}{775 \times 10^{-3}}=0.00552 \times 10^{3}=5.52 M$

7 0

3 years ago

Which statement best describes the relationship between igneous and metamorphic rocks?

solong [7]

Answer:

Igneous rocks must go through the sedimentary process to change into metamorphic rocks. Igneous rocks are chemically changed into metamorphic rocks because of high temperature and pressure. Metamorphic rocks are formed from melting igneous rocks. Metamorphic rocks and igneous rocks do not follow a rock cycle.

Explanation:

hope this helps!

6 0

3 years ago

Read 2 more answers

Lithium forms compounds which are used in dry cells and storage batteries and in high-temperature lubricants. It has two natural

agasfer [191]

The naturally occurring isotopes of Li are Li-6 of mass 6.015121 amu and Li-7 of mass 7.016003 amu. The atomic mass of Li is 6.9409 amu, the percent abundance can be calculated using the following relation.

Atomic mass=m(Li-6 )×%(Li-6 )+m(Li-7 )×%(Li-7 )

Let the percent abundance of Li-6 be X thus, that of Li-7 will be 1-X, putting the values,

$6.9409 amu=6.015121 amu\times X+7.016003 amu(1-X)$

Or,

$6.9409 =6.015121 X+7.016003-7.016003 X$

Or,

X=0.075

Thus, $1-X=1-0.075=0.925$

Thus, percent abundance of Li-6 is 0.075 or 7.5 % and that of Li-7 is 0.925 or 92.5%.

5 0

3 years ago

Read 2 more answers

Which of the following describes the cause of acid rain?

taurus [48]

Acid rain is caused by a chemical reaction that begins when compounds like sulfur dioxide and nitrogen oxides are released into the air. These substances can rise very high into the atmosphere, where they mix and react with water, oxygen, and other chemicals to form more acidic pollutants, known as acid rain.

6 0

4 years ago