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Vikentia [17]
3 years ago
11

I need help please I dont understand this ​

Chemistry
2 answers:
Bas_tet [7]3 years ago
7 0

Answer:

I think its B

Explanation:

Ba+2 + 2Cl- + 2Na+ + SO4- ----> BaSO4 is not soluable so you can't break that up.

BaSO4 (s) + 2 Na+ + 2Cl-

Snezhnost [94]3 years ago
6 0

Answer:

b

Explanation:

bbbbbbbbbbbbbb

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7 0
2 years ago
Which inorganic substance taken up by plants is also taken in and used directly by animals, including humans?
masha68 [24]

Answer: water

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Explanation:

3 0
3 years ago
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A sample of helium gas is placed in a rigid cylinder that has a movable piston. The volume of the gas is varied by moving the pi
Nataliya [291]
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3 years ago
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How much positive charge is in 0.7 kg of lithium? with each atom having 3 protons and 3 electrons. The elemental charge is 1.602
hichkok12 [17]

Explanation:

As a neutral lithium atom contains 3 protons and its elemental charge is given as 1.602 \times 10^{-19} C. Hence, we will calculate its number of moles as follows.

          Moles = \frac{mass}{\text{molar mass}}

                     = \frac{0.7 \times 1000 g}{7 g/mol}

                     = 100 mol

According to mole concept, there are 6.023 \times 10^{23} atoms present in 1 mole. So, in 100 mol we will calculate the number of atoms as follows.

        No. of atoms = 100 \times 6.023 \times 10^{23}

                               = 6.023 \times 10^{25} atoms

Since, it is given that charge on 1 atom is as follows.

                     3 \times 1.602 \times 10^{-19}C

                    = 4.806 \times 10^{-19}C

Therefore, charge present on 6.023 \times 10^{25} atoms will be calculated as follows.

    6.023 \times 10^{25} atoms \times 4.806 \times 10^{-19} C

            28.95 \times 10^{6}C

Thus, we can conclude that a positive charge of 28.95 \times 10^{6}C is in 0.7 kg of lithium.

3 0
2 years ago
PLEASE ANSWER: The density of a gas at STP is 0.75 g/L. What is the mass of this gas?
BartSMP [9]

Answer:

the mass of the glass is 2

3 0
3 years ago
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