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zhannawk [14.2K]
3 years ago
13

8. A wave has a frequency of 46 Hz and a wavelength of 2.1 meters. What is the speed of the wave?

Chemistry
1 answer:
AleksAgata [21]3 years ago
6 0

Answer:

the speed of the wave is 96.6

Explanation:

to find do frequency x wavelength

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How many grams of Mg are needed to produce 224 g of MgO in the complete reaction of Mg
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Answer:

134.4 g of Mg

Explanation:

reaction:

2Mg + O2 ➡️ 2MgO

1) find the mol of MgO

mol = mass / molar mass

mass = 224 g

molar mass = 24+16 = 40

mol = 224 / 40

= 5.6 moles

2 mol = 5.6 moles

2) find the mass of Mg

mass = mol × molar mass

mol = 5.6

molar mass = 24

mass = 5.6 × 24

= 134.4 g

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