2. Perform the following calculation, and round off the answer to the tulidut si

Question

2. Perform the following calculation, and round off the answer to the tulidut significant figures: a) 49.146 m + b72.13 m -9.1434 m b) 155,436 L = 5.3 L-6.24 L-8.177 L 0.307 g-14.2 mg-3.52 mg (1.22 cm-0.28 mm) x 0.752 cm x 0.51 cm The commonly accepted measurement now used by dietary specialists in assessing a person is overweight is the body mass index (BMI), which is based on a person's mass and height. It is the mass, in kilogram, divided by the square of the height in meters. Thus, the units for BMI are kg/m2. Generally speak9ng, if the BMI exceeds n25, a person is overweight. What is the BMI of a person who is 69.0 inches tall and weighs 158 lb? 3· The mass ratio of oxygen to magnesium in the compound magnesium oxide is 0.65831. What mass of magnesium oxide will form when 2.000 g of magnesium is converted to magnesium oxide by burning in pure oxygen? 4· 5. a) How many protons, neutrons and electrons are present in a Br atom? b) Use the notation E to represent the isotope of tin having 66 neutrons. Show that the following experiment is consistent with the law of conservation of mass (within the limits of experimental error): A 10.00-g sample of calcium carbonate was dissolved in 100.0 mL of hydrochloric acid solution (d = 1.148 g/mL). The products were 120.4 g of solution (a mixture of hydrochloric acid and calcium chloride) and 2. L ofcarbon dioxide gas (d = 0.001976 g/mL). 6.

Explanation / Answer

answer 5: a) Atomic mass= number of proton+ number of neutron= 81

atomic number= number of proton= 35= number of electrons

number of neutron= 81-35=46

b) Sn= atomic number= 50= number of protons

atomic mass= p+ n= 50+99=149

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