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harina [27]
3 years ago
7

use the periodic table to determine the molar mass of each of the following elements. Use the correct number of significant figu

res. Potassium
Chemistry
2 answers:
krek1111 [17]3 years ago
7 0

Answer: Potassium(K): 39.10 g/mol

Explanation:

Yanka [14]3 years ago
3 0

Answer: Potassium is 39.10 g/mol

Explanation: The numbers below the element are the molar mass.

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9. A family is driving to a nearby city. If they travel an average 68 miles per hour for 3.2 hours how
Nataliya [291]

All you have to do is multiply 68 miles and 3.2 hours. It will give you the answer, 217.6 mph.

68x3.2=217.6 miles per hour.

5 0
3 years ago
Read 2 more answers
How many molecules are in 2.5 mol of NaCl?
Vlada [557]

Answer:

1.51 x 10²⁴molecules

Explanation:

Given parameters:

Number of moles of NaCl  = 2.5moles

Unknown:

Number of molecules  = ?

Solution:

The number of molecules that can be found in a given mole is given as the Avogadro's constant;

       1 mole of substance  = 6.02 x 10²³ molecules

       2.5 mole of NaCl  = 2.5 x 6.02 x 10²³ molecules

                                       = 1.51 x 10²⁴molecules

6 0
3 years ago
Chlorine, which has an atomic mass of 35.453 amu, has two naturally occurring isotopes, Cl-35 and Cl-37. Which isotope occurs in
Pachacha [2.7K]

Cl-35 occurs in greater abundance.

The <em>weighted atomic mass</em> lies <em>closer to 35 u</em> than to 37 u, so the Cl-35 isotope must be more abundant.


8 0
3 years ago
A 5.20 mol sample of solid A was placed in a sealed 1.00 L container and allowed to decompose into gaseous B and C. The concentr
ELEN [110]

Answer:

2.60 moles of A remaining.

Explanation:

According to  Le Chatelier's principle, the equilibrium would shift if the volume, concentration, pressure, or temperature changes.

In this question, we were told that  the volume doubles, that implies that we would have to double the molarity of B/ C (since B=C.)

However, it is obvious and clear from the given equation of the reaction that  A is  solid in it's activity = 1. Hence, it is then ignored.

So doubling B would be 1.30 M × 2 = 2.60 M

i.e 2.60 M moles of A was consumed.

Now;  the number of moles of A remaining  is 5.20 - 2.60 = 2.60 moles of A remaining.

5 0
3 years ago
When a glowing splint bursts into flames during the decomposition of h2o2, it indicates that which gas is produced?
Nookie1986 [14]
If the glowing splint bursts into flames during the decomposition of H2O2, it will indicate at gas which will be produced. And that gas that is produced because of the glowing splint bursts is the type of gas called oxygen.
7 0
3 years ago
Read 2 more answers
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