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bija089 [108]
3 years ago
5

The Law of Conservation of Matter describes how mass is not lost during a chemical reaction.

Chemistry
2 answers:
weeeeeb [17]3 years ago
7 0

False, it states that matter can be nether created nor destroyed

crimeas [40]3 years ago
4 0

Answer:

false

Explanation:

because it tells you the matter can't be created or destroyed.

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Convert the following masses into kilograms:
beks73 [17]

Answer:

(a): 2,300 kilograms

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(c): 2.3 × 10^-5 kilograms

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Explanation:

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(a); divide the mass value by 1000

(b); divide the mass value by 1e+6

(c); divide the mass value by 1e+9

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What volume is occupied by 18.4 g oxygen at 28.0°C and a pressure of 0.998 torr? (round to sig figs)
Alexxandr [17]

Answer:

11.0 dm³

Explanation:

From the question,

Applying

PV= nRT............... Equation 1

Where P = pressure of oxygen gas, V = volume of oxygen gas, n = number of moles of oxygen, R = molar constant, T = Temperature.

make V the subeject of the equation

V = nRT/P............. Equation 2

But,

Number of mole (n) = Mass of oxygen(m)/Molar mass of oxygen(m')

n = m/m'....................... Equation 3

Substitute equation 3 into equation 2

V = mRT/Pm'............. Equation 4

Given: T = 28°C = (28+273) = 301 K, P = 0.998 torr = (0.998×0.00131579) = 1.3132 atm, m = 18.4 g

Constant: R = 0.082 atm.dm³/K.mol, m' = 32 g/mol.

Substitute these values into equation 4

V = (301×18.4×0.082)/(32×1.3132)

V = 454.1488/42.0224

V = 10.81 dm³

V = 11.0 dm³

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