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3 years ago

How do I write 2.345 X 10^-4cm out of scientific notation?

Chemistry

1 answer:

alexira [117]3 years ago

6 0

0.0002345cm
when the power of the 10 is negative, it makes the number smaller

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What are chemical reaction

scoray [572]

The reaction in which we can't take back the product to reactant form .Or in simple words the reaction which is irreversible is called chemical reaction

Example:-

Burning of wax

We cannot pull back the reaction to get wax back .

3 0

3 years ago

Read 2 more answers

A gas is at 35.0°c and 3.50 l. what is the temperature at 7.00 l?

Degger [83]

Answer:

363C

Explanation:

V = KT and T = V/K

3.5=k(35+273) = 308k

k=3.5/308 =0.011

new T=7.0/0.011=636K = 636-273 =363C

4 0

2 years ago

4.5 × 1025 atoms of nickel equal how many moles?

sweet [91]

There should be 4.5 moles

8 0

3 years ago

Be sure to answer all parts.

MrRissso [65]

Answer: The molarity of each of the given solutions is:

(a) 1.38 M

(b) 0.94 M

(c) 1.182 M

Explanation:

Molarity is the number of moles of a substance present in liter of a solution.

And, moles is the mass of a substance divided by its molar mass.

(a) Moles of ethanol (molar mass = 46 g/mol) is as follows.

$Moles = \frac{mass}{molar mass}\\= \frac{28.5 g}{46 g/mol}\\= 0.619 mol$

Now, molarity of ethanol solution is as follows.

$Molarity = \frac{moles}{Volume (in L)}\\= \frac{0.619 mol}{4.50 \times 10^{2} \times 10^{-3}L}\\= 1.38 M$

(b) Moles of sucrose (molar mass = 342.3 g/mol) is as follows.

$Moles = \frac{mass}{molar mass}\\= \frac{21.6 g}{342.3 g/mol}\\= 0.063 mol$

Now, molarity of sucrose solution is as follows.

$Molarity = \frac{moles}{Volume (in L)}\\= \frac{0.063 mol}{0.067 L} (1 mL = 0.001 L)\\= 0.94 M$

(c) Moles of sodium chloride (molar mass = 58.44 g/mol) are as follows.

$Moles = \frac{mass}{molar mass}\\= \frac{6.65 g}{58.44 g/mol}\\= 0.114 mol$

Now, molarity of sodium chloride solution is as follows.

$Molarity = \frac{moles}{Volume (in L)}\\= \frac{0.114 mol}{0.0962 L}\\= 1.182 M$

Thus, we can conclude that the molarity of each of the given solutions is:

(a) 1.38 M

(b) 0.94 M

(c) 1.182 M

4 0

3 years ago

A compound with a mass of 48.72g is found to contain 32.69g of zinc and 16.03g of sulfur. What is the percentage composition of

Inga [223]

Answer:

dic

Explanation:

4 0

3 years ago